A cardiology order may simply say “echo,” but that word is not enough to choose a CPT code. The coding decision depends on what kind of echocardiographic study was actually performed, how extensive the examination was, whether spectral and color Doppler were included, and who furnished the technical and professional portions.
That distinction is especially important for CPT code 93306. In everyday billing language, 93306 is often called a “complete echocardiogram,” but the code represents a specific type of complete transthoracic echocardiographic study with Doppler components built into the service. A focused follow-up examination may instead fall under 93308, while a complete study without the integrated Doppler components follows a different coding pathway.
For Medicare, the code itself is only one part of the claim. Documentation must support the scope of the study and the medical necessity for performing it, and local Medicare Administrative Contractor (MAC) policies may affect coverage. Commercial insurers and Medicare Advantage plans may have their own authorization, coverage, and claim-edit requirements.
This guide explains how 93306 fits into transthoracic echocardiography billing in 2026, how it differs from 93308 and 93307, what Doppler work is already included, how modifiers 26 and TC work, and which documentation issues commonly create denials.
CPT 93306 at a Glance
CPT 93306 is used for a complete transthoracic echocardiographic examination that includes two-dimensional imaging and the incorporated spectral Doppler and color-flow Doppler portions of the study. M-mode is part of the code framework when it is performed; it should not be described as a universally mandatory standalone element.
The service is diagnostic. It uses ultrasound through the chest wall to evaluate cardiac anatomy and function, including structures such as the ventricles, atria, valves, proximal great vessels, and pericardium when technically obtainable and clinically relevant.
The current CMS Transthoracic Echocardiography LCD describes TTE as ultrasound examination of the heart through the chest wall. It explains that two-dimensional imaging can assess chambers, myocardial wall motion and thickness, valvular structure and function, the proximal great vessels, and the pericardium. Doppler assessment adds information about blood-flow velocity, valve stenosis or regurgitation, intracardiac pressures, cardiac output, and possible shunts.
A useful shorthand is:
- 93306: complete TTE with spectral Doppler and color Doppler incorporated.
- 93307: complete TTE without those incorporated Doppler components.
- 93308: follow-up or limited TTE.
Those shorthand descriptions are helpful, but actual code selection should always be based on the current CPT code set, the documented service, and applicable payer policy.
What Is a Transthoracic Echocardiogram?
A transthoracic echocardiogram, or TTE, is a noninvasive cardiac ultrasound examination. A sonographer or other qualified professional places the transducer on the chest and acquires images from standard acoustic windows. The images allow the interpreting clinician to evaluate the heart in real time.
TTE can provide information about left and right ventricular size and function, atrial size, valve morphology, stenosis or regurgitation, pericardial effusion, estimated pressures, wall-motion abnormalities, and other structural or functional findings.
Doppler technology adds a different type of information. Spectral Doppler measures blood-flow velocities over time, while color-flow Doppler provides a color-coded representation of blood flow within the image. These tools can help characterize valve disease, intracardiac shunts, hemodynamic changes, and pressure gradients.
For coding purposes, those capabilities matter because the 93306 code structure already incorporates the complete study plus spectral and color Doppler. A claim that treats each of those components as if it were automatically separate can create an unbundling problem.
What Makes an Echocardiogram “Complete”?
The word “complete” does not mean that every possible cardiac structure must be perfectly visualized in every patient. Image quality can be limited by body habitus, lung disease, prior surgery, patient positioning, or other technical factors.
Instead, the question is whether the examination was performed and documented as a complete diagnostic TTE rather than a narrowly focused follow-up study.
CMS’s current Billing and Coding article for TTE, A56781, states that the medical record must fully support medical necessity and that each service requires a formal written report with interpretation. The article also expects image documentation to be retained and appropriate measurements to be included.
For a complete study, the CMS article describes a minimum set of measurements or valid substitutes when technically possible, including measurements or assessments of left ventricular dimensions, wall thickness, left atrial size, aortic valve motion, and left ventricular function. It also says that Doppler interrogation should document the modes used and provide appropriate qualitative and quantitative information.
That gives billers and coders a practical rule: do not decide that a study is “complete” from the order name alone. Read the actual report.
Documentation should show the scope of the study
A complete report usually makes the breadth of the examination obvious. It may address:
- Left ventricular size and systolic function
- Right ventricular size and function
- Left and right atrial size
- Valve structure and function
- Spectral Doppler measurements
- Color Doppler findings
- Estimated pressures or gradients when obtained
- Pericardial findings
- Proximal great-vessel findings when visualized
- Relevant measurements
- Final interpretation and impression
The exact contents vary with the patient, indication, and technical quality. The central issue is whether the service performed matches the complete-study code that was submitted.
What Is Included in CPT 93306?
One of the most common mistakes with 93306 is treating spectral Doppler and color-flow Doppler as automatically separate services.
They are not separate add-ons when they are the Doppler components already represented by 93306.
The code was designed to describe a complete TTE in which those Doppler services are incorporated. CMS has long reflected that coding structure in its echocardiography guidance, and the current local policies continue to distinguish 93306 from complete or limited studies that do not carry the same integrated Doppler components.
That means a practice should not routinely stack 93320 and 93325 on top of 93306 simply because spectral and color Doppler were performed. The claim should reflect the code structure that already represents the work.
What about M-mode?
M-mode is often discussed in descriptions of this code family, but the wording is “when performed.” It is therefore misleading to teach that a 93306 claim fails automatically whenever a report does not contain a separately documented M-mode tracing.
The more useful review is whether the complete TTE and Doppler service was actually performed, whether the report supports that scope, and whether the current codebook and payer rules are satisfied.
CPT 93306 vs. 93308
The distinction between 93306 and 93308 is not simply “more images versus fewer images.” The key difference is the scope and purpose of the examination.
| Feature | CPT 93306 | CPT 93308 |
| Study type | Complete TTE | Follow-up or limited TTE |
| Clinical purpose | Broad cardiac evaluation | Focused question or targeted reassessment |
| Spectral/color Doppler | Incorporated into 93306 | Evaluated separately when performed and reportable |
| Documentation | Supports complete examination | Clearly supports limited/follow-up scope |
| Typical use | Initial or comprehensive diagnostic assessment | Reassessment of a known issue or specific region/function |
CMS billing guidance gives useful examples of limited studies. A focused examination may be used to follow a pericardial effusion after surgery or to perform serial assessment of left ventricular function during certain therapies. In those situations, the clinician may not be repeating a comprehensive examination of every relevant cardiac structure.
Example: complete study
A patient presents with new dyspnea and a murmur. The clinician orders a full TTE. The report includes chamber measurements, ventricular function, valve assessment, spectral Doppler, color-flow evaluation, and an interpretation addressing the complete study.
That pattern may support 93306 when the code’s requirements and payer rules are met.
Example: limited study
A patient had a complete TTE last week and a moderate pericardial effusion was identified. A short-interval follow-up study is performed specifically to determine whether the effusion has enlarged and whether there are new hemodynamic findings.
That is a focused clinical question. A limited/follow-up code such as 93308 may be more appropriate than reporting another complete study simply because ultrasound images were obtained.
CPT 93306 vs. 93307
CPT 93307 is also a complete transthoracic echocardiographic study, but it does not represent the integrated spectral and color Doppler package built into 93306.
| Feature | CPT 93306 | CPT 93307 |
| Complete TTE | Yes | Yes |
| 2D imaging | Yes | Yes |
| M-mode | When performed | When performed |
| Spectral Doppler | Incorporated | Not incorporated |
| Color-flow Doppler | Incorporated | Not incorporated |
| Main coding distinction | Complete study with Doppler | Complete study without incorporated Doppler |
This is why 93307 should not be viewed as a “less detailed 93306.” Both are complete studies. Their difference is the included Doppler structure.
When a complete study and medically necessary Doppler are performed, the current code set should be reviewed to determine whether 93306 best represents the total service rather than separately constructing the same bundle from multiple codes.
Can 93320 or 93325 Be Billed With 93306?
For the Doppler work already represented by 93306, separate routine reporting creates an unbundling concern.
CMS echocardiography policy has specifically recognized that 93306 is used when Doppler is combined with a complete echocardiogram. In contrast, separate Doppler add-on codes can be relevant with other echocardiography services when their use is permitted by CPT rules, NCCI edits, and payer policy.
The safest workflow is not “Doppler was done, add another code.” It is:
- Identify the base echocardiographic service.
- Determine whether the base code already includes spectral or color Doppler.
- Check current CPT instructions and NCCI edits.
- Confirm the documentation supports any separately reported add-on service.
- Check payer-specific rules before claim submission.
This is the same principle discussed in MedIntelHub’s guide to preventing medical claim denials: two individually valid codes can still be an incorrect combination when one service is integral to another.
Modifier 26 and Modifier TC for CPT 93306
CPT 93306 is a diagnostic service that can be split into professional and technical components when the billing arrangement and payer rules support component billing.
CMS explains the professional/technical concept in its Physician Fee Schedule search guidance. For codes with a professional/technical component structure, modifier 26 identifies the professional component, while modifier TC identifies the technical component. A global service can be billed without either component modifier when one eligible entity furnishes both portions and the setting allows global billing.
Modifier 26: professional component
The professional component generally represents the physician or qualified professional work involved in interpretation and reporting.
A common scenario is a hospital outpatient department that owns the ultrasound equipment, employs the sonographer, and performs the technical acquisition. An independent cardiologist interprets the images and issues the final report.
The cardiologist may report the professional component with modifier 26 when the payer’s rules and the actual arrangement support it.
Modifier TC: technical component
The technical component generally represents resources such as:
- Ultrasound equipment
- Sonographer or technical personnel
- Image acquisition
- Technical supplies
- Practice expense associated with performing the test
The entity furnishing only the technical component may use modifier TC when the code and payer permit component billing.
Global billing
When the same eligible billing entity furnishes both technical acquisition and professional interpretation, 93306 may be reported globally without modifier 26 or TC, assuming the place of service and payer requirements allow global billing.
Component billing should reflect who actually furnished each part. Modifier selection should never be based only on which entity wants the reimbursement.
Other Modifiers That May Become Relevant
Modifiers beyond 26 and TC can appear in echocardiography billing, but they are situation-specific.
Modifier 25
Modifier 25 applies to an E/M service, not to the echocardiogram itself. If a significant, separately identifiable E/M service is performed on the same date as the diagnostic test and all requirements are met, modifier 25 may be relevant to the E/M code.
It should not be added automatically just because a patient saw a physician and had an echo on the same day.
Modifiers 76 and 77
These modifiers can be relevant when a procedure or service is repeated on the same day under circumstances that satisfy the modifier definition. Modifier 76 generally addresses a repeat service by the same physician or other qualified health professional, while modifier 77 addresses a repeat service by another physician or qualified health professional.
A repeat echocardiogram still needs a documented clinical reason. A repeat-procedure modifier does not create medical necessity.
Modifier 59 or X modifiers
Modifier 59 and the X{EPSU} modifiers should not be used merely to force payment for components that are already bundled into 93306.
If an NCCI edit applies, first determine whether the services are genuinely distinct and whether the edit permits a modifier. The documentation must support the distinct circumstances. Using a modifier to bypass an edit without a legitimate basis can convert a denial problem into a compliance problem.
Complete vs. Limited Studies: Why the Report Matters More Than the Order
Orders are often abbreviated. A physician may select “echo complete” in an EHR order set, or the scheduling note may say “2D echo.” Neither phrase proves which CPT code should be submitted.
The completed diagnostic report is the better source for code selection because it shows what was actually performed.
A coding review should ask:
- Was the study complete or focused?
- Were the expected structures and measurements evaluated?
- Were spectral and color Doppler performed?
- Does the report contain a formal interpretation?
- Is there permanent image documentation?
- Was the test technically limited, and if so, is that limitation documented?
- Was this a repeat study, and why was it repeated?
CMS’s A56781 article specifically requires documentation supporting medical necessity and reasons for repeat testing. It also expects a formal written report and retained image documentation.
Medicare Medical Necessity for 93306
A medically correct code is not automatically a covered service.
The current CMS TTE LCD describes echocardiography as potentially appropriate for a range of diagnostic questions involving ventricular function, cardiomyopathy, heart failure, valvular disease, complications of myocardial infarction, pericardial disease, congenital disease, selected arrhythmias, pulmonary hypertension, and other defined clinical scenarios.
Coverage depends on the patient’s documented condition and the policy applicable to the claim.
For example, a new symptom pattern suggesting structural heart disease may support a comprehensive TTE. By contrast, repeating a complete study at routine intervals in a stable patient without a documented reason may attract medical-necessity review.
Local policy matters
Medicare LCDs are issued by MACs and apply only within the contractor’s jurisdiction. The CMS Medicare Coverage Database should be checked for the beneficiary’s applicable policy.
Commercial insurers and Medicare Advantage plans can use different coverage criteria, authorization rules, or claim edits.
For that reason, an article or diagnosis list should never be treated as a national guarantee that CPT 93306 will be paid.
Screening vs. Diagnostic Echocardiography
A screening test and a diagnostic test are not the same billing situation.
Some Medicare echocardiography policies state that studies performed without a specific covered diagnostic indication may be treated as screening and may not be covered under that policy. A cardiac risk factor by itself does not automatically establish the medical necessity for a complete diagnostic TTE.
The clinical record should explain why the examination was ordered and how the result is expected to affect evaluation or management.
This distinction is particularly important when a patient has no symptoms, no abnormal examination findings, and no known condition that requires surveillance. The code may accurately describe the test performed while the payer still determines that the test does not meet coverage criteria.
That is why coding and coverage should be treated as separate questions.
Repeat Echocardiograms and Frequency
There is no universal Medicare rule that says every patient is entitled to one 93306 echocardiogram per year.
CMS’s current billing article states that repeat echocardiographic studies should be guided by the patient’s clinical status. Repeat testing can be appropriate when there is a meaningful change in symptoms or signs, suspected disease progression, a need to monitor a known condition, or another documented reason consistent with the applicable coverage policy.
When a repeat study is ordered, documentation should answer the obvious reviewer question: Why is another echocardiogram needed now?
Useful documentation may include:
- New or worsening symptoms
- New examination findings
- Change in known valve disease
- Change in heart-failure status
- Follow-up of an identified effusion
- Monitoring of ventricular function during therapy
- Suspected progression of cardiomyopathy
- New arrhythmia or hemodynamic concern when clinically relevant
- A prior study that was technically inadequate
- A clinically meaningful interval defined by disease-specific guidance or payer policy
The CMS article also says the medical record should clearly document reasons for multiple tests and what prior data were reviewed.
When CPT 93308 May Be More Appropriate
A limited TTE is not an inferior study. It is a focused study chosen because the clinical question is narrow.
Examples include:
- Rechecking a known pericardial effusion
- Reassessing left ventricular function during serial therapy monitoring
- Following one previously documented structural abnormality
- Rechecking a specific hemodynamic measurement
- Evaluating a targeted question after a recent complete study
If the study performed is limited, billing a complete 93306 merely because the practice usually orders “complete echo” can create a mismatch between the claim and the documentation.
Conversely, a genuinely complete study should not be downcoded solely because one structure was poorly visualized. Technical limitations should be documented, and code selection should reflect the service actually attempted and completed under applicable coding rules.
CPT 93306 Is Not a Stress Echocardiogram
Another common source of confusion is using 93306 as a catch-all echo code.
Stress echocardiography has its own CPT structure. It combines echocardiographic imaging with exercise or pharmacologically induced cardiovascular stress. The coding depends on which stress and imaging components are performed and who furnishes them.
A resting complete TTE coded with 93306 should not be assumed to represent the stress-echo service.
If both resting TTE and stress echocardiography are performed on the same date, the documentation and current code edits should be reviewed carefully. Duplicate or overlapping imaging can trigger bundling or medical-necessity scrutiny.
2026 NCCI Consideration: TAVR and Transcatheter Mitral Valve Procedures
The 2026 Medicare NCCI Policy Manual includes a specific rule that matters to cardiology practices.
In Chapter 5 of the 2026 Medicare NCCI Policy Manual, CMS states that transthoracic echocardiography codes 93306 through 93308 are not separately reportable by the physician performing a transcatheter aortic valve or mitral valve replacement procedure. The same passage addresses related TEE and Doppler echocardiography codes.
The practical point is not that an echo can never be clinically useful around a transcatheter valve procedure. The rule concerns separate reporting by the physician performing the intervention when the imaging is integral to that procedure.
When a separate imaging professional is involved, or when a distinct diagnostic service is performed at another time, the coding analysis can be different. Current CPT instructions, NCCI edits, and payer policy should be reviewed for the exact circumstances.
Contrast Echocardiography
Ultrasound-enhancing agents may be used when standard images do not adequately visualize the ventricular chambers or endocardial border.
CMS’s A56781 billing article states that claims for contrast echocardiography must be supported by documentation showing that conventional studies were inconclusive and that contrast enhancement was needed.
The coding can differ by setting. Hospital outpatient claims may involve HCPCS C-codes for contrast-enhanced echocardiography, while professional billing and supply reporting follow their own rules.
Do not assume that “93306 plus contrast drug” is the correct claim structure in every setting. Verify:
- The place of service
- The payer
- The applicable HCPCS/CPT instructions
- Whether the contrast agent supply is separately payable or packaged
- Documentation supporting the need for enhancement
ICD-10-CM Diagnosis Coding for 93306
There is no single national diagnosis list that guarantees payment for CPT 93306.
The diagnosis should accurately represent the documented condition, finding, symptom, or reason for the study under applicable ICD-10-CM reporting rules.
CMS’s A56781 article instructs providers to report the diagnosis that best describes the condition for which the test was performed. It also states that, for diagnostic tests, the result should be reported if known; otherwise the symptoms prompting the test should be reported, subject to applicable coding rules and setting.
Common clinical categories that can lead to TTE include heart failure, cardiomyopathy, valve disease, dyspnea with suspected cardiac cause, pericardial disease, pulmonary hypertension, congenital heart disease, and complications of myocardial infarction. But a diagnosis that appears on a payer list does not by itself prove that the test is reasonable and necessary for a particular patient.
Before billing, verify:
- The documented indication.
- The most accurate ICD-10-CM code.
- The payer’s coverage policy.
- Any frequency or repeat-study limitations.
- Whether authorization was required.
- Whether the diagnosis-to-procedure relationship is supported by the record.
Original Medicare fee-for-service rules are only one part of the payer landscape.
Some Medicare Advantage and commercial health plans use prior authorization or utilization-management programs for outpatient echocardiography. Requirements can depend on the plan, diagnosis, ordering provider, place of service, network status, or whether the test is repeated.
MedIntelHub’s guide to prior authorization requirements explains an important distinction: authorization is not the same thing as coverage or payment.
A payer can issue an authorization and later deny a claim because of:
- Incorrect coding
- Wrong rendering provider or facility
- Service outside authorized dates
- Missing modifier
- Unsupported diagnosis
- Documentation that does not match the approved service
- Duplicate testing
- Eligibility problems
- Contract or network issues
A good workflow therefore verifies authorization before the service and validates the final claim after the report is complete.
CPT 93306 Reimbursement in 2026
There is no single reliable national dollar amount that should be quoted as “the reimbursement for 93306.”
Payment can depend on:
- Medicare versus commercial coverage
- Geographic locality
- Professional, technical, or global billing
- Place of service
- Facility versus nonfacility payment rules
- Payer contract
- Participation status
- Applicable fee-schedule adjustments
- Packaging rules in facility settings
CMS’s Physician Fee Schedule resources are the appropriate starting point for Medicare professional payment research.
When checking the fee schedule, make sure you are looking at the correct year, locality, modifier configuration, and site-of-service context. A fee shown for the global service should not be compared directly with a professional-component claim.
For commercial payers, the contracted fee schedule or payer portal is more relevant than a Medicare national benchmark.
Place of Service and Split Billing
Echocardiography frequently involves more than one billing entity.
Physician office
A physician practice may own the equipment, employ the sonographer, and have its physician interpret the study. If all requirements are met, the practice may be able to report the global service.
Hospital outpatient department
The hospital may furnish the technical component, while a physician or physician group bills the interpretation. In that arrangement, the technical and professional claims are separated.
Independent diagnostic testing facility
An IDTF has additional Medicare enrollment, supervision, credentialing, and billing requirements. The provider should confirm that the testing personnel and interpreting professionals meet the applicable rules.
Place of service should reflect where the service occurred and how the components were furnished. Incorrect POS coding can affect payment and may trigger edits or recoupment.
Documentation Checklist for CPT 93306
Before a 93306 claim leaves the billing system, the record should allow a reviewer to answer both what was done and why it was done.
Order and medical necessity
Confirm:
- The ordering or treating practitioner is identified when required.
- The clinical indication is documented.
- Relevant symptoms, diagnoses, examination findings, or prior test results are present.
- The reason for repeat testing is documented when applicable.
Technical study
Confirm that the report or technical record supports:
- A complete transthoracic examination
- Two-dimensional imaging
- Spectral Doppler
- Color-flow Doppler
- Relevant measurements
- Any significant technical limitations
- Permanent image documentation
Interpretation
Confirm:
- A formal written interpretation is present.
- The findings support the submitted code.
- The report is authenticated according to applicable rules.
- The interpretation is not simply copied from a preliminary sonographer worksheet without physician or qualified professional review when such review is required.
Component billing
Confirm:
- The entity billing TC actually furnished the technical component.
- The entity billing 26 actually furnished the professional interpretation.
- A global claim is used only when the billing entity furnished both components and global billing is appropriate.
Common CPT 93306 Billing Errors
Reporting 93306 for a limited study
If the examination answers one narrow follow-up question, 93308 may better represent the service.
Separately billing Doppler that is already included
Adding spectral or color Doppler codes to 93306 without a valid coding basis creates unbundling risk.
Using modifier 26 or TC incorrectly
The modifier must match the component actually furnished.
Billing globally when the service was split
If one entity performed image acquisition and another interpreted the study, a global claim by either entity may be incorrect.
Repeating a complete study without documenting why
Repeat testing can be legitimate, but the chart should explain the clinical reason for another examination.
Using a diagnosis that does not match the medical record
The diagnosis on the claim should reflect the patient’s documented clinical situation, not merely a code that happens to appear on a payer coverage list.
Authorization is only one part of claim adjudication.
Using modifier 59 to override a bundle
A modifier does not make an integrated service separately payable unless the underlying coding and documentation rules support distinct reporting.
Confusing resting TTE with stress echocardiography
93306 does not represent every echocardiographic test.
Ignoring current NCCI rules
Medicare edits and policy guidance can change during the year. MedIntelHub’s guide to tracking payer and coding policy changes explains how to monitor these changes rather than relying on an old cheat sheet.
Practical Billing Scenarios
Scenario 1: complete TTE with Doppler in a physician office
A patient with new exertional dyspnea and a systolic murmur undergoes a comprehensive TTE. The practice owns the equipment, employs the sonographer, and the practice cardiologist interprets the study. The report supports a complete examination with spectral and color Doppler.
If all payer and medical-necessity requirements are met, the global 93306 service may be appropriate without 26 or TC.
Scenario 2: hospital performs the study, independent cardiologist interprets it
The hospital provides the equipment and sonographer. An independent cardiologist reviews the images and signs the final report.
The hospital reports its facility/technical service under the applicable billing system. The cardiologist may report the professional component with modifier 26 when permitted.
Scenario 3: focused follow-up of a pericardial effusion
A complete study was performed recently. The physician now needs only to assess whether a known effusion has changed.
A limited/follow-up study such as 93308 may be more appropriate than another complete 93306, depending on the work performed.
Scenario 4: complete echo without spectral or color Doppler
A complete two-dimensional transthoracic study is performed, but the integrated Doppler components represented by 93306 are not performed.
The documentation should be reviewed for the code that accurately describes the complete study without those Doppler components, such as 93307 when applicable.
Scenario 5: routine annual repeat with no clinical change
A stable patient receives a complete TTE because “it has been a year,” but the record contains no relevant clinical change or policy-supported surveillance rationale.
Even if 93306 accurately describes the study performed, the payer may question medical necessity.
Scenario 6: same-day office visit and echo
A cardiologist evaluates a patient for new symptoms and also performs an echocardiogram. The office visit is significant and separately identifiable from the work inherent in the diagnostic test.
When payer rules and documentation support it, an E/M service may be separately reported, with modifier 25 applied to the E/M service when required. Modifier 25 is not appended to 93306 merely because the services occurred on the same day.
A Pre-Submission Checklist for 93306 Claims
A short claim review can prevent a large amount of rework later.
Before submitting CPT 93306, confirm:
- The service performed was a complete TTE.
- The report supports spectral Doppler.
- The report supports color-flow Doppler.
- Any M-mode work is documented when performed.
- A formal interpretation and written report are present.
- Permanent image documentation is retained.
- The diagnosis matches the clinical indication.
- Repeat testing has a documented reason.
- The correct entity is billing the technical and professional components.
- Modifier 26 or TC is used only when appropriate.
- The place of service is correct.
- Authorization or referral requirements were checked.
- Current CPT and NCCI rules were reviewed when other cardiac imaging codes are billed the same day.
- Payer-specific coverage and frequency rules were checked.
- The claim does not separately unbundle Doppler already included in 93306.
That sequence fits into the broader medical billing workflow from visit to payment: verify coverage, document the actual service, code from the final record, run claim edits, submit to the correct payer, and reconcile the remittance.
Frequently Asked Questions
What is CPT code 93306?
CPT 93306 is used for a complete transthoracic echocardiographic study that incorporates two-dimensional imaging with spectral Doppler and color-flow Doppler. M-mode is included when performed. Exact reporting should be verified against the current CPT code set and payer rules.
Is CPT 93306 the code for every echocardiogram?
No. Echocardiography has separate codes for complete, limited, congenital, stress, transesophageal, and other studies. The service actually performed determines the code.
What is the difference between 93306 and 93308?
93306 represents a complete TTE with spectral and color Doppler incorporated. 93308 is a follow-up or limited TTE focused on a narrower clinical question.
What is the difference between 93306 and 93307?
Both can represent complete transthoracic examinations, but 93306 incorporates spectral and color-flow Doppler. 93307 represents the complete 2D study without those Doppler components built into the base code.
Can 93320 be billed with 93306?
Not routinely for the spectral Doppler work already incorporated into 93306. Separate Doppler reporting depends on the base service, current CPT instructions, NCCI edits, documentation, and payer rules.
Can 93325 be billed with 93306?
The color-flow Doppler component is already incorporated into 93306, so routine separate reporting of 93325 with 93306 would generally be inconsistent with the code structure.
Does 93306 require M-mode?
M-mode is included when performed. It should not be described as a universally mandatory standalone component in every circumstance. The complete study and documentation must still satisfy current coding and payer requirements.
What does modifier 26 mean on 93306?
Modifier 26 identifies the professional component, generally the interpretation and report, when the professional and technical portions are billed separately.
What does modifier TC mean on 93306?
Modifier TC identifies the technical component, generally the equipment, technical personnel, and image acquisition resources, when component billing is appropriate.
Can 93306 be billed without a modifier?
Yes, when an eligible entity furnishes both the professional and technical components and global billing is appropriate under the payer and site-of-service rules.
Can an office visit be billed on the same day as 93306?
Potentially. A significant, separately identifiable E/M service may be reportable when documentation and payer rules support it. Modifier 25, when required, belongs on the E/M service rather than the echocardiogram.
Does Medicare cover CPT 93306?
Medicare may cover a medically necessary TTE when the documentation and applicable coverage criteria are met. Coverage can depend on the beneficiary’s MAC jurisdiction, diagnosis, clinical indication, frequency, and other policy requirements.
Original Medicare and commercial payer requirements differ. Some Medicare Advantage and commercial plans may require authorization for outpatient echocardiography. Verify the patient’s specific plan before the service.
How often can 93306 be billed?
There is no universal “once per year” rule for every condition. Repeat frequency should be based on the clinical situation and applicable payer policy, and the reason for repeat testing should be documented.
Is 93306 used for a stress echocardiogram?
No. Stress echocardiography has a separate CPT coding structure. A resting complete TTE should not be confused with a stress-echo study.
Can 93306 be billed during TAVR?
The 2026 Medicare NCCI Policy Manual states that TTE codes 93306-93308 are not separately reportable by the physician performing a transcatheter aortic valve or mitral valve replacement procedure when the echocardiography is part of that procedure. Exact circumstances should be reviewed against current NCCI and CPT guidance.
Does a technically difficult study automatically become 93308?
No. Technical difficulty and limited clinical scope are not the same thing. The report should describe technical limitations, and the code should reflect the service actually performed and applicable coding rules.
Does the diagnosis code guarantee payment for 93306?
No. Code validity, documentation, medical necessity, coverage, authorization, and reimbursement are separate issues. A diagnosis code on a payer list does not guarantee payment.
Final Takeaway
CPT 93306 is best understood as a complete transthoracic echocardiographic service with spectral and color Doppler already incorporated. The coding problems usually arise when the claim does not match the actual scope of the study: a limited examination is billed as complete, included Doppler is billed again, component modifiers do not match who performed the work, or repeat testing is submitted without a documented clinical reason.
For a clean claim, start with the final report rather than the scheduling label. Confirm that the study was complete, verify the Doppler components, identify who furnished the professional and technical work, and connect the service to a documented clinical indication. Then check the current CPT code set, NCCI edits, MAC policy, and payer requirements for the date of service.
Resources
Centers for Medicare & Medicaid Services — Transthoracic Echocardiography LCD
CMS explains the clinical scope of transthoracic echocardiography and provides Medicare coverage guidance for the applicable MAC jurisdictions.
CMS Transthoracic Echocardiography LCD L33577
Centers for Medicare & Medicaid Services — Billing and Coding: TTE
This Medicare billing article provides documentation expectations, repeat-testing guidance, diagnosis coding instructions, and other operational details for TTE claims in the applicable jurisdictions.
CMS Billing and Coding Article A56781
Centers for Medicare & Medicaid Services — Echocardiography Billing Article
This additional MAC billing article provides useful examples distinguishing complete from follow-up or limited studies and discusses Doppler and screening considerations.
CMS Billing and Coding: Echocardiography A56625
Centers for Medicare & Medicaid Services — 2026 Medicare NCCI Policy Manual
The NCCI manual contains national Medicare coding-policy guidance, including a 2026 rule addressing separate reporting of transthoracic echocardiography during transcatheter aortic or mitral valve replacement procedures.
2026 Medicare NCCI Policy Manual, Chapter 5
Centers for Medicare & Medicaid Services — Physician Fee Schedule
Use the current CMS fee-schedule resources to review Medicare professional, technical, and global payment information by code, modifier, locality, and setting.
MedIntelHub — Editorial Policy
MedIntelHub’s editorial policy explains the standards used for medical, coding, billing, and healthcare-policy content.
Editorial Guidelines & Medical Disclaimer
This article is educational and informational. It is not medical advice, does not diagnose a medical condition, and does not replace evaluation or treatment by a qualified healthcare professional.
CPT, HCPCS, ICD-10-CM, Medicare, Medicaid, commercial payer, prior authorization, and reimbursement requirements can change. Coding should be based on the service actually performed, current code-set instructions, documentation, National Correct Coding Initiative edits when applicable, and the policy of the payer responsible for the claim. A valid CPT code or diagnosis code does not guarantee coverage or payment.
Medicare Local Coverage Determinations and related billing articles apply to defined contractor jurisdictions and should not be treated as universal rules for every Medicare claim. Medicare Advantage, Medicaid, and commercial plans may use different coverage, authorization, frequency, and claim-edit requirements.
When this article discusses echocardiography indications or clinical findings, those examples are provided to explain billing and documentation context. Decisions about whether an echocardiogram is medically appropriate should be made by the treating healthcare professional based on the patient’s clinical circumstances.
MedIntelHub uses authoritative medical, government, public-health, and coding sources where appropriate. Readers can review our Editorial Policy for more information about sourcing and editorial standards.
David Bennett
David Bennett is an author at MedIntelHub, where he creates clear, practical, and well-researched content about healthcare, medical billing, insurance, and patient education. His goal is to make complex healthcare topics easier for readers to understand and use in everyday situations. David emphasizes accuracy, transparency, and reliable sourcing, using information from trusted organizations and official healthcare resources whenever possible. Content published by David is intended for educational purposes and should not replace advice from qualified medical, legal, or healthcare professionals.