A patient returns for a diabetes follow-up. The chart says “type 2 diabetes,” lists metformin, and includes a recent A1c result. Which ICD-10-CM code belongs on the claim? It might be E11.9—but that answer changes if the clinician documents hyperglycemia, diabetic kidney disease, neuropathy, or another complication.
The ICD-10 code for type 2 diabetes mellitus starts with E11. For type 2 diabetes without documented complications, the commonly used billable code is E11.9. Other E11 codes identify specific manifestations, and E11.A identifies type 2 diabetes without complications in remission when the provider documents remission. The three-character category E11 is not billable by itself.
This guide covers the current U.S. ICD-10-CM rules—not the broader international ICD-10 classification—and explains what changed recently, what remained in effect for FY 2027, and how to avoid coding a condition that the medical record does not support.
Quick Answer: Which ICD-10-CM Code Should You Use?
| Clinical documentation | ICD-10-CM code | What it represents |
| Type 2 diabetes, no documented complications | E11.9 | Type 2 diabetes mellitus without complications |
| Type 2 diabetes with hyperglycemia | E11.65 | Type 2 diabetes mellitus with hyperglycemia |
| Type 2 diabetes with hypoglycemia, without coma | E11.649 | Type 2 diabetes mellitus with hypoglycemia without coma |
| Type 2 diabetes with diabetic CKD | E11.22 | Type 2 diabetes mellitus with diabetic chronic kidney disease |
| Type 2 diabetes with diabetic polyneuropathy | E11.42 | Type 2 diabetes mellitus with diabetic polyneuropathy |
| Type 2 diabetes with foot ulcer | E11.621 | Type 2 diabetes mellitus with foot ulcer |
| Type 2 diabetes, no complications, documented in remission | E11.A | Type 2 diabetes mellitus without complications in remission |
These are examples, not an exhaustive code list. Selecting a code still requires the provider’s documentation, the Alphabetic Index and Tabular List, any applicable additional codes, and the correct code set for the date of service. The CMS FY 2027 ICD-10-CM Official Guidelines explain the governing conventions.
What Does E11 Mean in ICD-10-CM?
E11 is the ICD-10-CM category for type 2 diabetes mellitus. Its more specific codes describe diabetes without complications, diabetes in remission without complications, and diabetes involving particular organs or clinical conditions. Those distinctions can materially change which diagnosis is reported.
ICD-10-CM diabetes codes are combination codes. A single code may identify the diabetes type and an associated manifestation, such as chronic kidney disease or polyneuropathy. When a patient has multiple diabetic complications, the official guidelines allow as many codes from the appropriate diabetes category as are needed to describe them. Code sequencing depends on the reason for the encounter and any applicable instructions.
For example, a clinician may document type 2 diabetes with diabetic chronic kidney disease and diabetic polyneuropathy. Reporting only E11.9 would omit both complications. The coding analysis may call for E11.22, E11.42, and a code identifying the CKD stage, subject to the complete record and current Tabular List instructions.
The designation also matters outside the billing office. ICD-10-CM codes identify diagnoses and reasons for care; they do not independently establish a disease, determine treatment, or promise that a payer will cover a service.
Why E11 alone is not a claim-ready diagnosis
A three-character category can organize many more specific codes. E11 is such a category. A claim typically needs a valid billable code such as E11.9 or E11.65 rather than the category heading. Other branches—including some retinopathy branches—also have nonbillable intermediate codes that require additional characters.
Always confirm billable status in the current tabular file. The CMS ICD-10 code-set page provides the official releases and related files.
E11.9: Type 2 Diabetes Mellitus Without Complications
E11.9 is appropriate when documentation supports type 2 diabetes without complications and no more specific diabetes code is required. It is often used for follow-up encounters in which the clinician evaluates the diabetes itself without documenting an associated complication.
Consider a primary care note that states “Type 2 diabetes mellitus without complications; continue current treatment.” If the documentation contains no other reportable diabetic manifestation, E11.9 may fit. The fact that a patient takes medication does not turn E11.9 into a complication code. Medication-use codes may be added when indicated, as explained below.
“Without complications” is not identical to “in remission.” The code for documented, complication-free remission is E11.A. The FY 2027 Tabular List includes an Excludes1 note distinguishing E11.9 from E11.A.
Does a normal A1c mean E11.9 is always correct?
No. A1c is a laboratory measure; a diagnosis code reflects the documented clinical condition and applicable coding rules. A person may have a lower A1c while still having documented diabetic neuropathy, retinopathy, or kidney disease. Those complications do not disappear from the record because a single glucose-related value improves.
Likewise, an isolated elevated A1c result does not, by itself, authorize a coder to diagnose hyperglycemia or change E11.9 to E11.65. Clinicians interpret laboratory information in context. The NIDDK overview of the A1C test explains what A1c measures and some circumstances in which results can be misleading.
E11.9 vs. E11.65: The Hyperglycemia Difference
E11.9 describes type 2 diabetes without complications. E11.65 describes type 2 diabetes with hyperglycemia—an elevated blood glucose state documented as part of the clinical diagnosis.
This can look straightforward in a code lookup, but actual notes are less tidy. A problem list might simply say “diabetes”; an assessment might say “uncontrolled type 2 diabetes”; and laboratory results may show high glucose. The coder should use the Alphabetic Index, official conventions, and the provider’s diagnostic wording rather than inferring a complication from a number alone.
| Point of comparison | E11.9 | E11.65 |
| Main description | Without complications | With hyperglycemia |
| Typical documentation | Type 2 diabetes without an associated complication | Type 2 diabetes with documented hyperglycemia |
| Can a laboratory result alone establish the code? | No | No |
| Is it a measure of treatment success? | No | No |
| Could other diabetes codes be necessary? | Yes, if supported by additional documentation | Yes, if other complications are also documented |
What about “uncontrolled” or “poorly controlled” diabetes?
ICD-10-CM does not simply reproduce the older ICD-9-CM controlled-versus-uncontrolled distinction. Terms such as uncontrolled or poorly controlled require interpretation under the Alphabetic Index and current guidance. Coders should not invent hypoglycemia or hyperglycemia from an ambiguous note. If the intended diagnosis remains uncertain after applying the official index conventions, a clarification query is safer than a guess.
A particularly important distinction: a documented hyperglycemia diagnosis is not the same thing as a coder independently seeing an elevated A1c. Documentation and clinical interpretation must come from the responsible healthcare professional.
Type 2 Diabetes ICD-10-CM Codes With Complications
The E11 category reaches well beyond E11.9 and E11.65. Diabetes can affect kidneys, nerves, eyes, circulation, skin, and other body systems. The relevant code depends on what is actually documented, including severity, laterality, and associated conditions when required.
Kidney disease: E11.21 and E11.22
E11.21 identifies type 2 diabetes with diabetic nephropathy. E11.22 identifies type 2 diabetes with diabetic chronic kidney disease. These are not interchangeable labels. When diabetic CKD is coded, the Tabular List directs coders to add a code from category N18 to describe the CKD stage when documented.
For example, type 2 diabetes with diabetic CKD stage 3b may require E11.22 and N18.32. The stage must be documented appropriately; a coder should not independently assign a CKD stage solely from an estimated glomerular filtration rate. If the patient also has hypertension or other renal diagnoses, review the separate conventions that govern those relationships.
Neurological complications: E11.40, E11.42, and E11.43
Diabetic neuropathy is not a single code description. E11.40 identifies diabetic neuropathy, unspecified; E11.42 is for diabetic polyneuropathy; and E11.43 identifies diabetic autonomic (poly)neuropathy. The clinician’s documentation determines how specifically the diagnosis can be coded.
Patients might describe burning, numbness, or altered sensation, but symptoms alone do not allow a coder to label those findings diabetic neuropathy. The relationship and diagnosis must be established through the clinical record and the applicable ICD-10-CM conventions.
Eye complications: retinopathy and other conditions
Diabetic eye disease often requires more detail than a basic four- or five-character code. E11.319, for example, identifies type 2 diabetes with unspecified diabetic retinopathy without macular edema. Other retinopathy branches distinguish mild, moderate, or severe nonproliferative disease; proliferative disease; macular edema; and, in many codes, the affected eye.
Do not stop at a nonbillable intermediate code when a full billable code is required. An ophthalmology note describing the right eye, disease severity, and macular-edema status may support a more specific selection than an unspecified code. The CDC discussion of diabetes complications explains why eye and kidney follow-up remain clinically relevant.
Circulatory complications: E11.51 and E11.52
E11.51 describes type 2 diabetes with diabetic peripheral angiopathy without gangrene; E11.52 describes diabetic peripheral angiopathy with gangrene. These are distinct clinical circumstances. A generic problem-list entry of “vascular disease” does not automatically justify a specific diabetes-with-angiopathy code if the complete diagnosis or linkage remains uncertain.
Foot ulcers: E11.621 and the additional L97 code
E11.621 reports type 2 diabetes with a foot ulcer. It does not describe the ulcer site in sufficient detail on its own. The Tabular List instructs the user to add an appropriate code from L97.4- or L97.5- to identify the site of the ulcer. Additional site, laterality, and severity details should follow the documentation and applicable code instructions.
For an encounter involving a diabetic foot ulcer, coding only E11.9 misses the documented manifestation. Coding only E11.621 can also be incomplete if the required ulcer detail is omitted. Pressure ulcers follow a different classification pathway; avoid treating every foot wound as the same type of ulcer.
Hypoglycemia, ketoacidosis, and hyperosmolarity
Other codes identify metabolic complications, including:
- 649: type 2 diabetes with hypoglycemia without coma.
- 641: type 2 diabetes with hypoglycemia with coma.
- 10: type 2 diabetes with ketoacidosis without coma.
- 11: type 2 diabetes with ketoacidosis with coma.
- 00: type 2 diabetes with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma.
- 01: type 2 diabetes with hyperosmolarity with coma.
These diagnoses involve clinically different presentations. The selection is not based on an isolated laboratory number or presumed severity. Diabetic ketoacidosis and hyperosmolar crises are potentially life-threatening; suspected acute emergencies require prompt clinical assessment rather than self-interpretation of a code list.
When More Than One E11 Code Is Appropriate
A patient does not have to fit into just one complication category. The official guidelines allow as many diabetes codes as needed to describe all documented manifestations. For example, a record may support both E11.22 (diabetic CKD) and E11.42 (diabetic polyneuropathy), together with the appropriate CKD-stage code.
Do not add E11.9 merely to restate the diabetes when complication codes already describe the condition. More codes are not automatically better; each reported diagnosis must be supported and must comply with the Tabular List, encounter rules, and payer requirements.
Code order is also contextual. The condition chiefly responsible for an office visit may differ from the condition chiefly responsible for inpatient admission. Documentation, applicable code-first or use-additional-code notes, and the encounter setting all matter. The FY 2027 official guidelines distinguish outpatient and inpatient reporting requirements.
How ICD-10-CM Treats the Relationship Between Diabetes and a Complication
The coding convention for “with” can surprise people accustomed to reading each diagnosis as unrelated unless a clinician writes “due to.” Under the official ICD-10-CM guidelines, when “with” or “in” connects conditions in the Alphabetic Index, code title, or Tabular List instruction, the classification generally presumes an association unless the provider clearly documents that the conditions are unrelated or another guideline requires explicit linkage.
That is not permission to attribute every symptom or every diagnosis to diabetes. First establish that the condition exists, look it up correctly, and review the actual index entry and any notes. If the record expressly says a condition is unrelated to diabetes, or if an unclear diagnosis creates a coding conflict, seek clarification rather than overriding the documentation.
Example: A chart documenting diabetes and CKD may require the coder to evaluate the indexed “diabetes, with, chronic kidney disease” relationship. A chart mentioning occasional tingling, by contrast, does not establish a diagnosis of diabetic polyneuropathy merely because diabetes is also present.
Additional ICD-10 Codes for Insulin and Diabetes Medication Use
The E11 category carries instructions for identifying certain long-term medication use. These are generally status codes describing current treatment, not diagnoses of a diabetes complication.
| Code | Meaning | Typical context |
| Z79.4 | Long-term (current) use of insulin | Insulin used as an ongoing treatment |
| Z79.84 | Long-term (current) use of oral hypoglycemic drugs | Ongoing oral antidiabetic treatment when applicable |
| Z79.85 | Long-term (current) use of injectable non-insulin antidiabetic drugs | Ongoing eligible injectable non-insulin therapy |
The FY 2027 guidance explains when to assign multiple Z79 codes if different medication classes are used together. A patient taking an oral antidiabetic medication and insulin on an ongoing basis may require both Z79.84 and Z79.4, with the appropriately supported E11 diagnosis code.
It also expressly states that Z79.4 should not be assigned for insulin given only temporarily to bring a type 2 patient’s blood sugar under control during an encounter. Confirm the medication route and intended long-term use rather than relying on the name of a drug alone.
Using insulin does not automatically mean a patient has type 1 diabetes. The official guidelines explain that if diabetes type is not documented, the classification defaults to E11.- even when insulin use is recorded. A better clinical record should still clarify the actual diagnosis whenever possible.
FY 2027 Update: E11.A for Type 2 Diabetes in Remission
E11.A — Type 2 diabetes mellitus without complications in remission deserves particular attention in the current code set. Its history is easy to misstate.
- October 1, 2025:A was introduced with the FY 2026 ICD-10-CM update.
- October 1, 2026: The FY 2027 ICD-10-CM code set took effect, and E11.A remained valid.
- September 30, 2027: The FY 2027 release period ends; the applicable future release should be checked for subsequent services.
The American Academy of Family Physicians’ October 2025 coding update documents the code’s introduction. The CMS FY 2027 guidelines continue the remission-specific instructions.
What documentation supports E11.A?
The FY 2027 guideline says to assign E11.A based on provider documentation that type 2 diabetes is in remission. If the record is unclear, the provider should be queried. The guideline gives a telling example: a note that says “resolved” is not synonymous with remission.
The code itself is limited to type 2 diabetes without complications in remission. It has an Excludes1 note involving E11.0–E11.8 (type 2 diabetes with complications) and E11.9 (without complications, not in remission). This is why documentation of current diabetic complications must be checked carefully before selecting E11.A.
Clinical remission criteria are not a shortcut to code assignment
A major international consensus report published in Diabetes Care proposed an HbA1c below 6.5% measured at least three months after stopping glucose-lowering medication as the usual clinical criterion for remission. It also advises continuing follow-up because hyperglycemia and complications can recur or persist. See the American Diabetes Association-led consensus report on remission.
That clinical framework helps clinicians assess remission. It does not authorize a coder to infer E11.A from lab results or a medication list. The responsible provider must document the remission diagnosis. A patient taking effective diabetes medicine and recording excellent A1c values has not automatically met the usual clinical remission definition.
E11.A vs. E11.9 at a glance
| Question | E11.9 | E11.A |
| Is type 2 diabetes documented? | Yes | Yes |
| Are diabetic complications documented? | No | No |
| Must the provider document remission? | No | Yes |
| Does a low A1c alone establish the code? | No | No |
| Are they routinely reported together? | No; review the Excludes1 instructions | No; review the Excludes1 instructions |
A history of diabetes, controlled diabetes, and diabetes in remission are not automatically interchangeable concepts. Current diabetes in remission also calls for ongoing appropriate clinical follow-up; it should not be presented to patients as a guaranteed cure.
Choosing the Correct Code: A Practical Documentation Workflow
A dependable approach begins with the medical record rather than a search engine snippet.
- Confirm the diagnosis and diabetes type. Review the clinician’s assessment. Different diabetes categories exist for type 1, type 2, drug-induced, underlying-condition-related, and other specified diabetes.
- Identify documented manifestations. Look for hyperglycemia, CKD, neuropathy, eye disease, vascular complications, ulcers, or documented remission. Do not build a diagnosis from symptoms alone.
- Consult the Alphabetic Index. Trace diabetes and any “with” entries. Check which association conventions apply to the particular documented conditions.
- Verify the final code in the Tabular List. Check billable specificity, inclusion terms, Excludes notes, additional-code requirements, laterality, stage, and any sequencing instructions.
- Check medication status. Determine whether current long-term use supports Z79.4, Z79.84, Z79.85, or a combination.
- Apply encounter and date-of-service rules. Outpatient, inpatient, pregnancy, and related settings can alter reporting or code order.
- Clarify conflicts. Query the provider when documentation is unclear or inconsistent rather than making a clinical diagnosis as a coder.
A diagnosis code’s presence does not guarantee medical necessity, authorization, coverage, payment, or a particular reimbursement rate. Those are separate questions governed by documentation, services performed, and applicable payer policy. The distinction between diagnosis codes and procedure codes is also discussed in MedIntelHub’s guide to 2026 CPT code changes.
Seven Type 2 Diabetes Coding Examples
These are simplified educational examples. Real claims require the full medical record, all current code notes, and encounter-specific coding rules.
Example 1: Routine diabetes visit without complications
Documentation: “Type 2 diabetes mellitus without complications.” The patient takes an oral diabetes medication on an ongoing basis.
Possible codes: E11.9, plus Z79.84 when documentation supports long-term oral antidiabetic use. No complication code should be invented from a glucose reading or the mere presence of medication.
Example 2: Type 2 diabetes with documented hyperglycemia
Documentation: “Type 2 diabetes with hyperglycemia.” The clinician evaluates elevated glucose and modifies the care plan.
Possible code: E11.65. Other codes depend on the remainder of the record; a single abnormal laboratory result without the diagnosis would not establish this code by itself.
Example 3: Diabetic chronic kidney disease, stage 3b
Documentation: “Type 2 diabetes with diabetic CKD, stage 3b.”
Possible codes: E11.22 and N18.32. Further renal or hypertensive coding may apply if separately supported. The stage is based on the clinical documentation, not independent staging by the coder.
Example 4: Diabetes with polyneuropathy
Documentation: “Type 2 diabetes with diabetic polyneuropathy.”
Possible code: E11.42. If CKD or another separate diabetic complication is also documented, more than one E11 code may be appropriate.
Example 5: Diabetes with a foot ulcer
Documentation: “Type 2 diabetes with foot ulcer,” including the foot location, laterality, and ulcer severity.
Possible codes: E11.621 and the appropriate L97.4- or L97.5- code. Exact selection requires the ulcer details documented in the clinical record.
Example 6: Type 2 diabetes without complications in remission
Documentation: The clinician expressly diagnoses “type 2 diabetes in remission,” with no current diabetic complication documented.
Possible code: E11.A. Do not substitute E11.A when the chart merely says “diabetes resolved” or shows an improved A1c without a provider-documented remission diagnosis.
Example 7: Diabetes with more than one complication
Documentation: “Type 2 diabetes with diabetic CKD stage 3a and diabetic polyneuropathy.”
Possible codes: E11.22, E11.42, and N18.31. The relevant E11 codes describe different complications; E11.9 is not added simply to represent the underlying diabetes again.
Type 1, Type 2, Gestational, and Prediabetes Are Not the Same Code
A search for an “ICD-10 diabetes code” can return codes from several different categories. Picking E11 solely because a patient is an adult—or because they use insulin—can be wrong.
| Classification | General code family | Coding point |
| Type 1 diabetes mellitus | E10.- | Different category from type 2 diabetes |
| Type 2 diabetes mellitus | E11.- | Select a specific billable E11 code |
| Diabetes due to an underlying condition | E08.- | Follow underlying-condition sequencing rules |
| Drug- or chemical-induced diabetes | E09.- | Follow drug/chemical-related instructions |
| Other specified diabetes mellitus | E13.- | Includes certain postprocedural and secondary forms |
| Gestational diabetes | O24.4- | Pregnancy-specific code family |
| Prediabetes | R73.03 | Not equivalent to a confirmed diabetes diagnosis |
A person with pre-existing type 2 diabetes during pregnancy requires consideration of an O24 pregnancy code first, followed by the appropriate diabetes code when applicable. That situation is not identical to gestational diabetes first recognized during pregnancy. Obstetric coding also requires trimester, childbirth, and other details as instructed by the code set.
Screening should not be confused with diagnosing diabetes. When a clinician orders glucose testing in someone without established diabetes, the reason for screening or evaluation may be coded differently from a confirmed diagnosis. MedIntelHub’s annual physical examination guide explains how diabetes screening can fit into routine preventive care.
Common Coding Mistakes That Can Affect Claims
Reporting E11 instead of a billable code. E11 is a category heading, not a complete claim diagnosis.
Using E11.9 despite a documented complication. A chart that specifically identifies diabetic CKD or hyperglycemia needs to be evaluated for the corresponding complication code, rather than defaulting automatically to “without complications.”
Treating every abnormal A1c as E11.65. Coders report diagnoses, not diagnoses they have independently inferred from test results.
Forgetting a required additional code. Diabetic CKD can require an N18 stage code, and a diabetic foot ulcer has additional L97 site instructions.
Assigning long-term insulin use for a temporary dose. The official diabetes guideline expressly excludes that interpretation of Z79.4.
Assuming all injectable diabetes drugs use Z79.4. Non-insulin injectable drugs are identified by a different Z79 code when applicable.
Calling E11.A a newly created FY 2027 code. The remission code was introduced in FY 2026 on October 1, 2025, and continues in FY 2027.
Equating remission with cure or “resolved.” The FY 2027 guidelines require provider documentation of remission, and clinical monitoring remains relevant.
Applying one payer’s reimbursement rules to every claim. The appropriate ICD-10-CM code does not by itself establish coverage or payment. Medicare, Medicaid programs, and commercial payers may impose different requirements for particular services.
Frequently Asked Questions
1. What is the ICD-10 code for type 2 diabetes mellitus?
The relevant ICD-10-CM category is E11. Because E11 is nonbillable, a claim needs a more specific code, such as E11.9 for type 2 diabetes without complications or E11.65 when hyperglycemia is documented.
2. What does ICD-10-CM code E11.9 mean?
E11.9 means type 2 diabetes mellitus without complications. It is not a universal code for every person with type 2 diabetes and should not replace more specific documented manifestations.
3. Is E11.9 a billable code in FY 2027?
Yes. E11.9 is a valid billable diagnosis code in the FY 2027 ICD-10-CM release, which applies to encounters from October 1, 2026, through September 30, 2027.
4. What is the difference between E11.9 and E11.65?
E11.9 means type 2 diabetes without complications; E11.65 means type 2 diabetes with hyperglycemia. Code selection depends on the provider’s documentation and ICD-10-CM rules—not a coder’s interpretation of a single lab value.
5. What is the ICD-10 code for type 2 diabetes with chronic kidney disease?
E11.22 identifies type 2 diabetes with diabetic CKD. An additional N18.- code generally identifies the documented stage. For instance, N18.32 identifies CKD stage 3b.
6. What is the ICD-10 code for type 2 diabetes with neuropathy?
The specific code depends on the diagnosis: E11.40 covers diabetic neuropathy, unspecified, while E11.42 covers diabetic polyneuropathy. Other E11.4- codes describe additional neurological manifestations.
7. What code describes type 2 diabetes with a foot ulcer?
E11.621 identifies type 2 diabetes with foot ulcer. The Tabular List also instructs coders to add an appropriate L97.4- or L97.5- code for the ulcer site and other supported details.
8. What is the ICD-10 code for type 2 diabetes with hypoglycemia?
E11.649 identifies type 2 diabetes with hypoglycemia without coma; E11.641 identifies it with coma. These are different diagnoses and should not be selected without supporting clinical documentation.
9. What is the new code for type 2 diabetes in remission?
E11.A identifies type 2 diabetes mellitus without complications in remission. It was introduced October 1, 2025, for FY 2026 and remains valid in FY 2027. Remission must be documented by the provider.
10. Does an A1c below 6.5% mean I should use E11.A?
No. A clinical consensus uses an A1c below 6.5%, sustained for at least three months without usual glucose-lowering medication, as a typical remission criterion. Coding E11.A still requires an appropriate provider-documented remission diagnosis and review of existing complications.
11. Can E11.A and E11.9 appear together?
These codes have an Excludes1 relationship because E11.A describes complication-free remission while E11.9 describes type 2 diabetes without complications not in remission. Follow the current Tabular List instead of reporting both for the same diabetes condition.
12. Does insulin use mean the ICD-10 code should be E10?
No. Many people with type 2 diabetes use insulin. The diabetes type is determined from clinical documentation and coding conventions; eligible ongoing insulin use can be identified separately with Z79.4.
13. Can I report E11.22 and E11.42 together?
Yes, when the record supports both diabetic CKD and diabetic polyneuropathy. The official guidelines allow multiple diabetes codes to describe distinct manifestations. An additional CKD-stage code may also be needed.
14. Does the type 2 diabetes diagnosis code guarantee reimbursement?
No. A valid diagnosis code is only one component of a claim. Payers may separately evaluate the service, documentation, coverage criteria, medical necessity, eligibility, authorization, and other billing rules.
15. Which code set applies to services in late 2026?
For U.S. encounters dated October 1, 2026, through September 30, 2027, use the FY 2027 ICD-10-CM release. Services before October 1, 2026, should be checked against the code set in effect on their actual date.
A Better Way to Read an E11 Diagnosis
The useful question is not simply “What is the code for type 2 diabetes?” It is “What exactly did the clinician document about this patient’s type 2 diabetes at this encounter?”
For a chart with no complications, E11.9 may be right. Documented hyperglycemia points to E11.65; diabetic kidney disease or polyneuropathy can require their own codes and additional detail. E11.A has a narrower purpose: documenting complication-free type 2 diabetes in remission, rather than an automatically “resolved” diagnosis.
In FY 2027, the safest habit remains the same: read the assessment, confirm the code in the current Tabular List, follow additional-code instructions, and separate accurate diagnosis reporting from payer coverage or payment. A thorough code lookup takes only a little longer than choosing a familiar E11 number—and can prevent avoidable clarification requests and claim corrections.
Resources
CMS — FY 2027 ICD-10-CM Official Guidelines for Coding and Reporting
The primary federal source for diagnosis-coding conventions, diabetes combination-code instructions, medication-use status, remission documentation, and reporting rules.
Read the FY 2027 coding guidelines (PDF)
CMS — ICD-10 Code Sets and Releases
Official code-set downloads and release dates for ICD-10-CM and ICD-10-PCS, including the current fiscal year.
CDC/NCHS — ICD-10-CM Release Files
The National Center for Health Statistics provides the U.S. ICD-10-CM code releases and identifies their periods of use.
Review ICD-10-CM release files
American Academy of Family Physicians — Annual ICD-10 Update Includes New Diabetes Code
The October 2025 family-medicine coding update documents the introduction of E11.A, helping distinguish its original release from its continued presence in FY 2027.
American Diabetes Association and International Expert Group — Definition and Interpretation of Remission in Type 2 Diabetes
The consensus report explains the clinical framework for remission and emphasizes continuing monitoring. Clinical criteria should not be confused with authority to assign an ICD-10-CM diagnosis without provider documentation.
Read the diabetes remission consensus report
NIDDK — The A1C Test and Diabetes
A patient-facing explanation of A1c testing, diagnostic thresholds, confirmation, and important test limitations.
CDC — Put the Brakes on Diabetes Complications
A general overview of kidney, eye, neurological, cardiovascular, and foot complications and why clinical follow-up matters.
Read the CDC diabetes complications guide
Editorial Guidelines & Medical Disclaimer
This MedIntelHub article is for education and general information. It is not a diagnosis, treatment plan, or substitute for individualized advice from a qualified healthcare professional. It does not instruct readers to start, stop, or change diabetes medication. Treatment decisions, interpretation of glucose or A1c results, and assessment of diabetes remission should be made with the responsible clinical team. Severe or rapidly worsening symptoms—especially possible metabolic emergencies—warrant urgent medical evaluation.
Coding examples are illustrative, not claim-specific coding or reimbursement advice. ICD-10-CM, CPT, HCPCS, payer coverage, billing, and reimbursement policies can change. Before submitting a claim, verify the applicable date-of-service code set, current official ICD-10-CM Index and Tabular List, any relevant CPT/HCPCS resources, complete clinical documentation, and the responsible payer’s current rules. A code’s availability does not ensure medical necessity, coverage, or payment; Medicare, state Medicaid programs, and commercial payer requirements can differ.
The article draws on official CMS and CDC coding guidance, public-health information, and recognized clinical consensus literature. For information about source selection, corrections, and review standards, read MedIntelHub’s editorial policy.
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.