A mammography claim can look straightforward until one detail changes the entire coding path. A patient may arrive for a routine screening, receive standard bilateral images, have 3D tomosynthesis added, or need immediate diagnostic views because the radiologist sees something that requires a closer look. Those scenarios are related, but they are not billed the same way.
CPT code 77067 is the central code for bilateral screening mammography. It is not a general-purpose mammography code, and it does not replace the diagnostic mammography codes used when the examination is performed to evaluate a symptom, abnormal finding, or other diagnostic concern. The relationship between 77067 and 77063 also matters because 77063 is an add-on code for screening digital breast tomosynthesis rather than a stand-alone substitute for the screening mammogram.
For Medicare, the distinctions become even more specific. Coverage frequency, patient cost sharing, same-day conversion from screening to diagnostic imaging, modifiers, diagnosis coding, and facility certification all affect how a claim may be processed. Commercial plans and Medicaid programs can use different authorization, network, and payment policies, so a valid CPT code does not by itself guarantee coverage or reimbursement.
This guide explains how CPT 77067 fits into current 2026 billing practice, how it differs from 77063, 77065, and 77066, what Medicare requires when a screening examination becomes diagnostic on the same day, and where common claim errors begin.
What Is CPT Code 77067?
CPT 77067 is used for a bilateral screening mammography examination. In practical terms, it represents a screening study of both breasts, generally using two standard views of each breast. The current CMS Medicare Claims Processing Manual identifies 77067 as the screening mammography code and notes that computer-aided detection, or CAD, is included when performed.
The purpose of the study is what separates screening mammography from diagnostic mammography. Screening is performed to look for breast cancer in a person who does not currently have a breast problem that requires diagnostic evaluation. A diagnostic mammogram, by contrast, is performed to investigate a clinical concern such as a lump, nipple discharge, focal pain, an abnormal screening result, or another documented finding that requires targeted evaluation.
That distinction matters because 77067 should not be selected simply because mammographic images were obtained. The coder or billing team needs to know why the examination was performed and what service was actually completed.
What 77067 does not mean
CPT 77067 does not mean “any mammogram.” It does not describe a unilateral diagnostic mammogram, a bilateral diagnostic mammogram, or diagnostic tomosynthesis. It also should not be treated as a code that automatically proves preventive coverage. The claim still has to meet the payer’s eligibility, frequency, coding, and billing requirements.
What Does a Screening Mammogram Do?
A screening mammogram uses low-dose x-ray imaging to look for breast changes that may not be noticeable on physical examination. Screening can identify calcifications, masses, architectural distortion, asymmetries, and other findings that may need comparison with prior images or additional evaluation.
The examination is a screening service when its purpose is routine detection rather than workup of a current problem. If the patient already has a symptom or a known abnormality that needs evaluation, the service may instead fall into the diagnostic mammography pathway. The exact decision depends on the clinical indication and the imaging performed.
Screening recommendations and insurance benefit rules should not be confused. The U.S. Preventive Services Task Force recommends biennial screening mammography for women ages 40 through 74 at average risk. Medicare’s benefit structure, however, covers eligible screening mammography once every 12 months for women age 40 or older. A clinical recommendation and a payer’s frequency rule answer different questions.
CPT 77067 vs. 77065 vs. 77066
The most important mammography coding distinction is whether the examination is screening or diagnostic and, for diagnostic mammography, whether one or both breasts are examined.
| Code | General use | Laterality | Typical purpose |
| 77067 | Screening mammography | Bilateral | Routine breast-cancer screening |
| 77065 | Diagnostic mammography | Unilateral | Evaluation of a problem or abnormality in one breast |
| 77066 | Diagnostic mammography | Bilateral | Diagnostic evaluation involving both breasts |
A patient with no current breast complaint who presents for routine bilateral screening is generally in the 77067 pathway. A patient referred for evaluation of a new palpable lump, a suspicious screening finding, or another documented problem may require diagnostic mammography instead.
The number of images alone does not convert a screening study to diagnostic mammography. Diagnostic coding depends on the purpose and nature of the examination, not simply whether more images were obtained than expected.
Why screening intent matters
Using 77067 for a diagnostic encounter can produce medical-necessity, frequency, or benefit-processing problems. The reverse can also create issues because preventive screening and diagnostic services may have different patient cost sharing and different payer rules.
The claim, order or referral information when applicable, facility workflow, technologist documentation, and radiologist’s interpretation should tell a consistent story about why the study was performed.
CPT 77067 vs. 77063: 2D Screening and 3D Tomosynthesis
CPT 77063 describes bilateral screening digital breast tomosynthesis, often called 3D mammography. It is an add-on code. CMS’s current 2026 NCCI policy states that 77063 may be reported with 77067 when the screening tomosynthesis service is performed.
That means 77063 does not replace 77067 merely because a facility uses 3D technology. Instead, the coding relationship is generally:
- 77067 for the primary bilateral screening mammography service.
- 77063 in addition to 77067 when bilateral screening digital breast tomosynthesis is performed and reporting requirements are met.
The 2026 Medicare NCCI Policy Manual specifically identifies 77063 as an add-on code and links it to the screening mammography service.
Is 77063 a stand-alone screening code?
Not in the usual Medicare coding structure. Because 77063 is an add-on code, reporting it by itself omits the primary screening procedure it is designed to accompany. CMS’s breast-cancer screening workgroup has also noted that stand-alone 77063 reporting may reflect miscoding or incomplete episode information.
For commercial insurers, confirm whether the plan follows standard CPT add-on-code reporting or has any plan-specific claim requirements. The underlying CPT relationship does not eliminate payer-specific edits.
Screening Tomosynthesis vs. Diagnostic Tomosynthesis
Screening tomosynthesis and diagnostic tomosynthesis should not be treated as interchangeable. CPT 77063 belongs to the screening pathway. For Medicare diagnostic digital breast tomosynthesis, HCPCS code G0279 is used in addition to the appropriate diagnostic mammography code when the requirements are met.
A useful way to think about the distinction is:
- Screening mammography: 77067.
- Screening tomosynthesis add-on: 77063.
- Diagnostic mammography: 77065 or 77066.
- Diagnostic tomosynthesis add-on under Medicare: G0279.
The clinical reason for imaging and the actual service performed should drive code selection.
What Happens When a Screening Mammogram Becomes Diagnostic?
Sometimes a patient arrives for a routine screening examination, but the radiologist identifies an abnormality that needs additional diagnostic views while the patient is still at the facility. Medicare recognizes this same-day transition.
The current CMS Medicare Claims Processing Manual allows the radiologist to order and interpret additional diagnostic films based on the screening findings while the beneficiary remains at the facility. Medicare may pay for both the screening and diagnostic mammography when the requirements are met.
This is not the same as simply relabeling the original screening study as diagnostic. There are two reportable services because the screening examination led to additional diagnostic work.
2026 Medicare modifier requirements for same-day screening and diagnostic mammography
The 2026 Medicare NCCI Policy Manual gives a more detailed modifier instruction for this situation:
- Report the diagnostic mammography code with modifier GG.
- Report the screening mammography code with modifier 59 or XU.
Modifier GG tells Medicare that a screening mammogram and diagnostic mammogram were performed for the same patient on the same day because the screening examination led to diagnostic evaluation. Modifier 59 or XU on the screening service addresses the NCCI edit in the same-day circumstance described by CMS.
Do not generalize this Medicare rule to every payer. A commercial plan may use different edit logic or modifier instructions. Verify current payer policy before claim submission.
Understanding Modifier GG
Modifier GG is a Medicare-specific tracking and payment modifier used when screening mammography converts to diagnostic mammography on the same date of service. It belongs on the diagnostic mammography code in the qualifying scenario.
A common mistake is to append GG to 77067 itself. CMS instructions instead associate GG with the diagnostic code. The screening code is separately handled under the current NCCI rule with modifier 59 or XU when appropriate.
Modifier GG should not be used simply because a patient has had previous abnormal imaging or because a diagnostic study occurs on another date. The modifier is tied to the same-day screening-to-diagnostic situation described by Medicare.
Professional and Technical Components of CPT 77067
Radiology services can have a professional component and a technical component. Which entity reports which component depends on the setting, ownership arrangement, payer rules, and how the service was furnished.
Modifier 26: professional component
Modifier 26 identifies the professional component when the interpreting physician bills only for the interpretation and report rather than the complete global service. The professional work generally includes reviewing the images, analyzing findings, and issuing the interpretation.
A Medicare LCD addressing breast imaging notes that interpretation of mammography may be reported with modifier 26 when the professional component is billed separately. The same interpretation should not be billed again by another provider simply because that provider reviews the report as part of a separate visit.
Modifier TC: technical component
Modifier TC identifies the technical component when applicable. The technical component generally includes the imaging equipment, technologist work, image acquisition, supplies, and operational resources used to produce the study.
Not every claim setting uses TC in the same manner. Institutional billing, hospital outpatient claims, and other facility arrangements may follow different claim structures than physician-office or freestanding imaging billing.
Global billing
When one billing entity legitimately furnishes both the technical and professional components and payer rules allow global billing, the service is generally reported without splitting it into 26 and TC components.
Component modifiers describe who is billing which part of the service. They do not change screening into diagnostic mammography, and they do not establish coverage by themselves.
What ICD-10-CM Diagnosis Code Is Used With CPT 77067?
For routine screening mammography, ICD-10-CM code Z12.31 is commonly used to represent an encounter for screening mammography for malignant neoplasm of the breast. CMS’s current breast-imaging billing article identifies Z12.31 for screening mammography codes 77067 and 77063.
The important caution is that a correct diagnosis code does not guarantee payment. The CMS breast-imaging billing article explicitly states that use of an appropriate ICD-10-CM code does not assure coverage; the service still must satisfy applicable coverage requirements.
If the encounter is actually diagnostic, the diagnosis coding should reflect the documented reason for the diagnostic examination rather than forcing a screening diagnosis onto the claim. Examples may include documented symptoms, imaging abnormalities, personal history, or other conditions when clinically and coding appropriate.
Do not use a diagnosis code simply to obtain payment
Diagnosis coding must follow the patient’s documented clinical circumstances. Changing a diagnosis solely because a payer prefers a different code creates an accuracy and compliance problem. If a claim denies for diagnosis-related reasons, first verify the documentation, coding, payer policy, and whether the original service was truly screening or diagnostic.
Medicare Coverage for CPT 77067 in 2026
Medicare Part B covers eligible screening mammography as a preventive benefit. According to the current Medicare mammography coverage page:
- A woman age 35 through 39 may be eligible for one baseline mammogram in her lifetime.
- A woman age 40 or older may be eligible for screening mammography once every 12 months.
- Diagnostic mammography may be covered more frequently when medically necessary.
For covered baseline and screening mammograms, the beneficiary generally pays nothing when the provider accepts assignment. Diagnostic mammography follows different cost-sharing rules: after the Part B deductible is met, the patient generally pays 20% of the Medicare-approved amount.
These are Medicare benefit rules. Commercial insurance, Medicare Advantage, Medicaid, and employer plans may structure preventive benefits differently.
Medicare’s 12-month benefit is not the same as a clinical screening recommendation
This difference deserves emphasis because it can create confusion for both patients and billing staff. Medicare’s benefit allows eligible annual screening. The USPSTF’s current recommendation for average-risk women ages 40 through 74 is biennial screening.
A coverage interval tells you when a payer may pay under a benefit. A clinical guideline tells clinicians and patients what screening interval a guideline panel recommends for a defined population. Individual risk, previous findings, clinician recommendations, and other guidelines may lead to different clinical decisions.
Does Medicare Require a Physician Order for Screening Mammography?
A Medicare LCD for breast imaging states that a physician referral is not required for screening mammography. That does not mean every mammography facility operates without scheduling, registration, or documentation requirements, and it should not be generalized to all commercial plans.
When a screening mammogram reveals an abnormality and the interpreting radiologist orders same-day diagnostic views, Medicare allows the radiologist to proceed under the applicable rules without obtaining a new treating-physician order for those additional views. The radiologist must still communicate results and meet the related documentation and billing requirements.
For other payers, check the member’s benefit plan and the imaging facility’s current policy.
There is no universal answer across all insurers. Traditional Medicare’s preventive screening structure is not the same as a commercial insurer’s utilization-management program. Some plans may not require prior authorization for routine screening mammography, while others may impose administrative requirements for certain imaging services, sites of care, or network arrangements.
Before a scheduled study, staff may need to verify:
- Eligibility on the date of service.
- Preventive screening benefits.
- Frequency limitations.
- Network status of the facility and interpreting provider.
- Referral requirements, if any.
- Prior authorization requirements, if any.
- Whether tomosynthesis is covered and how it should be reported.
MedIntelHub’s prior authorization guide explains why authorization, medical necessity, coding, and payment are related but separate questions.
Mammography Facility Certification and MQSA Requirements
Mammography is subject to federal quality standards under the Mammography Quality Standards Act, or MQSA. The FDA MQSA program requires mammography facilities, with limited exceptions, to meet federal certification, accreditation, personnel, equipment, quality-assurance, and inspection requirements.
For Medicare, facility certification is not a minor administrative detail. CMS states that Medicare reimburses screening mammography when furnished through appropriately certified facilities. A technically correct CPT code does not overcome a facility-level certification problem.
Breast-density notification is now a federal requirement
The FDA’s amended MQSA regulations have been in effect since September 10, 2024. Mammography facilities must include breast-density information in reports to healthcare providers and in patient lay summaries using the required federal framework.
Breast density can affect the sensitivity of mammography and is associated with breast-cancer risk. The FDA’s reporting requirement is a communication and quality standard; it does not mean that every person with dense breasts automatically qualifies for supplemental ultrasound or MRI under every payer policy.
Does CPT 77067 Include Computer-Aided Detection?
Yes, CAD is included in the current 77067 service description when performed. This is an area where older coding references can cause problems because historical mammography coding used separate approaches that no longer reflect current reporting.
Billing teams should use the current year’s CPT resources and payer guidance instead of carrying forward old mammography code combinations from legacy templates.
For broader coding-update workflow, see MedIntelHub’s 2026 CPT code changes guide.
How Many Units of CPT 77067 Should Be Reported?
CPT 77067 is inherently bilateral. It describes the screening examination of both breasts rather than a per-breast unit that must be doubled. A routine bilateral screening mammogram therefore should not be converted into two units simply because both breasts were imaged.
Likewise, the standard views used to complete the screening study are part of the service. Additional views obtained only because more images are needed to complete the same screening examination do not automatically create another unit of 77067.
When a screening abnormality leads to a separate diagnostic study, that is a different coding question. Medicare has a specific same-day screening-to-diagnostic pathway, as discussed above. For unusual repeat imaging or payer-specific unit questions, verify the current CPT instructions, NCCI edits, MUE information, and payer policy rather than applying a blanket “one per day” rule.
Should Modifier 50 Be Added Because 77067 Is Bilateral?
Usually no. The code itself already describes a bilateral screening examination. Modifier 50 is generally used to indicate a bilateral service when the underlying code is not already defined as bilateral.
Appending a bilateral modifier to a code that already includes both sides can create unnecessary claim edits. As always, follow the current payer’s claim instructions if it publishes a specific exception.
Screening Mammography, Symptoms, and Diagnostic Intent
One of the easiest ways to create an incorrect claim is to ignore the reason the patient is being imaged. A routine screening appointment and an appointment to evaluate a new breast lump may use similar imaging equipment, but they serve different purposes.
A patient with a current sign or symptom may need diagnostic imaging instead of a screening examination. Common diagnostic indications can include a new palpable mass, focal pain, nipple discharge, skin or nipple changes, a prior abnormal imaging finding, or another documented concern. The radiologist and referring clinician determine the appropriate clinical imaging pathway.
Coding staff should not independently convert a diagnostic study to screening merely because the patient is due for a routine mammogram. The code must follow the service actually performed and documented.
Documentation That Supports CPT 77067
Documentation should be clear enough to show that the service was a bilateral screening mammography examination and to support the claim details submitted to the payer. The exact documentation requirements vary by setting and payer, but useful records typically include:
- Patient identifying information and date of service.
- Screening indication.
- Relevant history and prior breast imaging information when available.
- Confirmation of the bilateral screening examination performed.
- Tomosynthesis documentation when 77063 is also reported.
- Radiologist interpretation and final assessment.
- Communication of results in accordance with MQSA requirements.
- Ordering, referring, or treating provider information when required by the payer or circumstance.
Documentation should also be consistent with diagnosis coding. A record describing a diagnostic workup should not be paired with a screening claim simply because 77067 is a familiar preventive code.
Common CPT 77067 Billing Errors
Reporting 77067 for a diagnostic examination
This can happen when the patient presents with a symptom or known abnormality but the claim is submitted as preventive screening. The denial may appear as a diagnosis mismatch, frequency problem, or benefit issue depending on the payer.
Billing 77063 without the primary screening code
Because 77063 is an add-on code, stand-alone reporting can trigger edits or incomplete billing. Verify that the primary screening mammography service is present when the tomosynthesis add-on is appropriately reported.
Treating 77063 as a replacement for 77067
3D technology does not automatically eliminate the primary screening mammography code. Under Medicare’s coding framework, 77063 is reported in addition to 77067 when the screening tomosynthesis service is performed.
Missing the same-day modifiers when screening converts to diagnostic
For Medicare in 2026, the diagnostic mammography code should carry GG and the screening mammography code should carry 59 or XU in the qualifying same-day scenario. Omitting required modifiers can cause NCCI or payment edits.
Using the wrong diagnosis
Z12.31 is the usual screening diagnosis context for 77067, but it should match the actual encounter. A diagnostic service requires diagnosis coding supported by the clinical reason for diagnostic evaluation.
Ignoring frequency limitations
A Medicare beneficiary age 40 or older is generally eligible for screening mammography once every 12 months. A claim filed too early may deny unless another covered circumstance applies.
Assuming preventive means every payer pays 100%
Medicare has specific preventive cost-sharing rules for eligible screening mammography. Commercial plans may apply Affordable Care Act preventive-service requirements, grandfathered-plan rules, network requirements, benefit design, or other coverage terms differently. Diagnostic imaging is especially likely to have different cost sharing than preventive screening.
Incorrect professional or technical component billing
If the radiologist and imaging facility bill separately, the claims must correctly represent which component each party furnished. Duplicate global and component claims can produce denials or overpayment risk.
Common CPT 77067 Denial Reasons
A denial does not necessarily mean the CPT code itself is invalid. The issue may arise elsewhere in the revenue cycle. Common areas to investigate include:
- Patient was not eligible on the date of service.
- Screening frequency requirement was not met.
- Claim was submitted as screening when the service was diagnostic.
- Diagnosis did not match the service or payer policy.
- 77063 was reported without the appropriate primary code.
- Same-day screening and diagnostic modifiers were missing or incorrect.
- Prior authorization or referral requirement was not met for a payer that requires it.
- Facility or provider network status affected coverage.
- Professional and technical components were duplicated or misreported.
- Claim was submitted twice.
- Facility certification or enrollment information was not recognized.
- Payer applied a plan-specific edit for tomosynthesis or preventive benefits.
When a claim denies, start with the payer’s actual adjustment and remark information rather than guessing. MedIntelHub’s claim denial prevention and follow-up checklist provides a structured way to review eligibility, authorization, coding, modifiers, units, and payer edits before resubmission or appeal.
Practical CPT 77067 Billing Examples
Example 1: routine bilateral screening mammogram
A 52-year-old Medicare beneficiary with no current breast symptoms presents for her eligible annual screening mammogram. A standard bilateral screening examination is completed.
The core procedure code is 77067. The screening diagnosis is generally Z12.31 when supported by the encounter. Medicare frequency and eligibility requirements still need to be met.
Example 2: screening mammography with 3D tomosynthesis
A patient receives bilateral screening mammography and bilateral screening digital breast tomosynthesis during the same screening encounter.
When coding requirements are met, 77067 represents the primary screening mammography and 77063 represents the add-on screening tomosynthesis service. The payer’s coverage and claim rules for tomosynthesis should still be checked.
Example 3: screening converts to diagnostic mammography on the same day
A Medicare beneficiary arrives for routine screening. The radiologist identifies an abnormal area and orders additional diagnostic mammographic views before the patient leaves the facility.
Under the current 2026 Medicare NCCI rule, the diagnostic mammography code is reported with modifier GG, and the screening mammography code is reported with modifier 59 or XU in the qualifying same-day situation. The diagnostic diagnosis should reflect the documented reason for the additional workup.
Example 4: patient presents with a new breast lump
A patient schedules imaging because of a newly palpable breast mass. The imaging is being performed to evaluate a clinical problem rather than for routine screening.
The service may require diagnostic mammography coding rather than 77067, depending on the study performed. The diagnosis should reflect the documented clinical indication. Calling the examination “annual mammography” in scheduling software does not override its diagnostic purpose.
Example 5: Medicare screening repeated before the benefit interval
A 67-year-old Medicare beneficiary had a screening mammogram eight months ago and returns for another routine screening with no new diagnostic indication.
The claim may not meet the Medicare once-every-12-month screening benefit. Staff should verify the prior service date, eligibility, and whether the new study is truly screening or whether a medically necessary diagnostic indication exists.
Example 6: radiologist and imaging center bill separately
A freestanding imaging center furnishes the technical portion of a screening mammogram, while an independent radiologist performs and bills the interpretation.
The parties must report the applicable technical and professional components according to payer and setting rules. Modifier 26 may identify the radiologist’s professional component; modifier TC may identify the technical component when that claim structure is appropriate.
CPT 77067 at a Glance
| Item | Practical point |
| Code type | CPT radiology code |
| Main service | Bilateral screening mammography |
| Screening or diagnostic? | Screening |
| Laterality | Bilateral by definition |
| CAD | Included when performed |
| 3D screening add-on | 77063 when appropriate |
| Diagnostic unilateral code | 77065 |
| Diagnostic bilateral code | 77066 |
| Common screening diagnosis | Z12.31 when supported |
| Medicare screening interval | Generally once every 12 months for eligible women age 40+ |
| Same-day screening-to-diagnostic Medicare modifier | GG on diagnostic; 59 or XU on screening under 2026 NCCI policy |
| Professional component | Modifier 26 when separately reportable |
| Technical component | Modifier TC when separately reportable |
| Major claim risk | Confusing screening intent, diagnostic workup, and tomosynthesis reporting |
Screening vs. Diagnostic Mammography: Why Patient Cost Can Change
Patients are often surprised when a mammography visit that began as screening produces diagnostic cost sharing. Medicare provides a useful example of why that happens. Eligible screening mammography is a preventive benefit with no patient cost when the provider accepts assignment, while diagnostic mammography generally has Part B deductible and 20% coinsurance requirements.
Commercial plans can also distinguish preventive screening from diagnostic follow-up. A patient’s cost may change when the service moves from a preventive screening benefit to diagnostic evaluation, even when both services happen during the same visit.
That is why front-desk and billing staff should avoid promising that “mammograms are always free.” The more accurate explanation is that preventive screening may have special cost-sharing protection under the patient’s plan, while diagnostic imaging is processed under different benefit rules.
Patients who receive an insurer statement after imaging can use MedIntelHub’s guide to reading an Explanation of Benefits to compare the claim, allowed amount, insurer payment, adjustments, and patient responsibility.
Frequently Asked Questions
What does CPT code 77067 mean?
CPT 77067 is the code used for bilateral screening mammography. It represents a screening examination of both breasts and includes computer-aided detection when performed under the current code description.
Is CPT 77067 screening or diagnostic?
It is a screening code. Diagnostic mammography is generally reported with 77065 for a unilateral examination or 77066 for a bilateral examination.
Is CPT 77067 bilateral?
Yes. Bilateral is built into the code. The service is not reported as one unit for each breast simply because both breasts are examined.
Does CPT 77067 include CAD?
Yes, computer-aided detection is included when performed. Separate legacy CAD billing should not be carried forward without checking current coding rules.
What is the difference between CPT 77067 and 77063?
77067 is the primary bilateral screening mammography code. 77063 is an add-on code for bilateral screening digital breast tomosynthesis, or 3D mammography, and may be reported with 77067 when the service and payer rules support it.
Can CPT 77063 be billed without 77067?
Under the standard Medicare coding structure, 77063 is an add-on code and is not intended to replace the primary screening mammography code. Stand-alone reporting may trigger a coding edit or indicate incomplete reporting.
What is the difference between 77067 and 77065?
77067 describes bilateral screening mammography. 77065 describes unilateral diagnostic mammography. The screening-versus-diagnostic purpose and laterality are different.
What is the difference between 77067 and 77066?
77067 is bilateral screening mammography. 77066 is bilateral diagnostic mammography. A diagnostic study is performed to evaluate a clinical concern or abnormal finding rather than routine screening.
Can screening and diagnostic mammography be billed on the same day?
Yes, Medicare permits both in a qualifying situation when the screening examination identifies an abnormality and additional diagnostic mammography is performed on the same date. Current 2026 Medicare NCCI guidance requires GG on the diagnostic code and 59 or XU on the screening code.
What is modifier GG in mammography billing?
For Medicare, modifier GG indicates that a screening mammogram and diagnostic mammogram were performed for the same patient on the same day in the recognized screening-to-diagnostic scenario. It is appended to the diagnostic mammography code.
Does CPT 77067 need modifier 26?
Modifier 26 is used only when the professional component is billed separately. It is not automatically required on every 77067 claim.
Can modifier TC be used with 77067?
Modifier TC may be used to identify the technical component when the billing setting and payer rules permit separate technical-component reporting. Institutional claim structures may differ.
What diagnosis code is commonly used with CPT 77067?
Z12.31 is commonly used for an encounter for screening mammography for malignant neoplasm of the breast. The diagnosis must match the documented screening encounter, and correct diagnosis coding does not guarantee payment.
Does Medicare cover CPT 77067?
Medicare Part B covers eligible screening mammography. Women age 40 or older are generally eligible once every 12 months, while women ages 35 through 39 may be eligible for one baseline mammogram in their lifetime.
Does Medicare charge coinsurance for a screening mammogram?
For covered baseline and screening mammography, the beneficiary generally pays nothing when the provider accepts assignment. Diagnostic mammography has different cost-sharing rules.
There is no universal rule across all payers. Traditional Medicare screening policy differs from commercial and managed-care plans. Verify the patient’s actual plan requirements before the service.
Does a Medicare patient need a physician referral for screening mammography?
A Medicare LCD states that a physician referral is not required for screening mammography. Other plans and individual facilities may have different administrative requirements.
Why was CPT 77067 denied?
Possible causes include frequency limitations, eligibility problems, incorrect screening-versus-diagnostic coding, diagnosis mismatch, incorrect 77063 reporting, missing same-day modifiers, duplicate billing, network issues, or payer-specific coverage rules. Review the payer’s denial codes and policy before correcting or appealing the claim.
Practical Takeaway
CPT 77067 is straightforward only when the encounter itself is straightforward. It represents bilateral screening mammography, includes CAD when performed, and forms the primary screening code when 77063 tomosynthesis is also reported. The code should not be used as a catch-all for diagnostic breast imaging.
The billing details become especially important when a screening examination changes course. In Medicare’s same-day screening-to-diagnostic scenario, 2026 NCCI guidance calls for GG on the diagnostic mammography code and 59 or XU on the screening code. Medicare also applies its own screening frequency and cost-sharing rules, while commercial plans may use different authorization, network, and payment policies.
The safest workflow is to keep five questions separate: What service was performed? Was it screening or diagnostic? Was tomosynthesis performed? Does the documentation support the diagnosis and modifiers? And what does the patient’s current payer require? Keeping those questions distinct prevents many of the coding shortcuts that lead to mammography denials.
Resources
Centers for Medicare & Medicaid Services — Medicare Claims Processing Manual, Chapter 18
CMS provides Medicare billing instructions for screening and diagnostic mammography, including 77067, 77063, diagnostic mammography codes, diagnosis requirements, and modifier GG.
Medicare Claims Processing Manual, Chapter 18
Centers for Medicare & Medicaid Services — 2026 Medicare NCCI Policy Manual, Chapter 9
The 2026 radiology chapter explains the 77063 add-on relationship and the current same-day screening/diagnostic modifier requirements for Medicare.
2026 Medicare NCCI Policy Manual — Radiology Services
Medicare.gov — Mammograms
Medicare’s beneficiary coverage page explains eligibility, screening frequency, baseline mammography, and cost sharing for screening and diagnostic mammograms.
FDA — Mammography Quality Standards Act and MQSA Program
The FDA explains federal mammography facility certification, accreditation, quality standards, personnel requirements, inspection, and the MQSA program.
FDA — Understanding Breast Density
This resource explains breast density and the federal MQSA breast-density notification requirements now used in mammography reporting and patient summaries.
U.S. Preventive Services Task Force — Breast Cancer Screening
The USPSTF recommendation provides the current clinical screening recommendation for average-risk women ages 40 through 74 and explains how that recommendation differs from payer benefit frequency.
USPSTF Breast Cancer Screening Recommendation
Editorial Guidelines & Medical Disclaimer
This article is for educational and informational purposes. It explains medical coding and billing concepts related to screening mammography but does not diagnose breast conditions, determine whether an individual needs mammography, or replace advice from a qualified healthcare professional.
Clinical screening recommendations depend on age, breast-cancer risk, prior imaging, symptoms, family and personal history, and other factors. People with a new breast lump, nipple discharge, skin changes, focal breast symptoms, or other concerning findings should seek appropriate clinical evaluation rather than relying on a coding article to decide whether screening or diagnostic imaging is needed.
CPT, HCPCS, ICD-10-CM, Medicare, Medicaid, commercial payer, prior-authorization, coverage, and reimbursement requirements can change. A valid code does not guarantee medical necessity, coverage, authorization, or payment. Before submitting a claim, verify the current year’s official coding resources, CMS instructions when applicable, current NCCI edits, payer policies, contracts, and date-of-service requirements.
CPT is a registered trademark of the American Medical Association. This article paraphrases coding concepts for education and does not reproduce the full proprietary CPT codebook.
MedIntelHub uses authoritative medical, public-health, and coding sources and aims to distinguish coding rules from payer-specific coverage and reimbursement policy. 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.