Type 2 Diabetes ICD-10 Codes: The Complete E11 List and What Your Code Means

If you have type 2 diabetes, your medical record carries a code for it, and that code is more specific than most people realize. It appears on lab orders, insurance claims, patient-portal visit summaries and referral letters, and it changes as your condition changes. All type 2 diabetes codes live in one family of the ICD-10-CM code set, the United States’ clinical modification of the World Health Organization’s International Classification of Diseases, maintained by the Centers for Medicare and Medicaid Services (CMS) and the National Center for Health Statistics. The family is category E11, Type 2 diabetes mellitus. About 40.1 million people in the United States have diabetes, and in adults type 2 accounts for roughly 90 to 95 percent of diagnosed cases, according to the CDC National Diabetes Statistics Report , so E11 codes are among the most frequently used diagnosis codes in American health care.

This guide lists the E11 codes the way clinicians and coders actually use them: E11.9 for diabetes without complications, E11.65 for diabetes with hyperglycemia, the complication families for kidney, eye, nerve, circulation, skin and foot problems, the newer remission code E11.A, and the extra Z codes that record insulin and other drug use. Every code below is taken from the ICD-10-CM tabular list (fiscal year 2027, effective October 1, 2026). It also explains, in plain language, how a coder chooses between codes and why the code attached to your name matters for coverage.

How the E11 code family is built

ICD-10-CM diabetes codes are combination codes: a single code captures the type of diabetes, the body system affected and the specific complication. Category E11 itself is only a heading and is never billed on its own. The character after the decimal point names the complication family, and further characters add detail such as severity, whether coma is present, or which eye is affected. A code is reported to its highest available specificity, so a four-character code is used only when no fifth or sixth character exists for it.

Two default rules shape everything that follows. First, if the medical record says “diabetes” without stating a type, the ICD-10-CM Official Guidelines direct coders to default to type 2, category E11. Second, using insulin does not make diabetes type 1: the type documented by the clinician decides the category, and insulin use in type 2 is recorded separately with code Z79.4, covered below.

The type 2 diabetes codes most people actually see

Of the 87 billable codes in the E11 family, a short list accounts for the large majority of claims and portal entries. If you are looking up a code from your own paperwork, it is probably one of these.

E11.9: type 2 diabetes without complications

E11.9 is the workhorse code for straightforward type 2 diabetes. It is assigned when the clinician documents type 2 diabetes and records no diabetic complication: no kidney disease, no retinopathy, no neuropathy, no circulation problem, and no documented hyperglycemia or hypoglycemia for that encounter. It is also the code reached by the default rule when a chart simply says “diabetes” with no type and no complication.

What E11.9 does not mean is “mild” or “cured.” It is a statement about documentation at that visit, not a grade of how serious the diabetes is. And it cannot share a claim with the complication codes: because E11 codes are combination codes, once a complication is documented the specific complication code replaces E11.9 rather than sitting next to it. A patient whose chart lists diabetic polyneuropathy is coded E11.42, not E11.9 plus a separate nerve code.

E11.65: type 2 diabetes with hyperglycemia

E11.65 is used when the clinician documents hyperglycemia alongside type 2 diabetes: wording such as “hyperglycemia,” “elevated blood sugar,” “poorly controlled” or “uncontrolled diabetes” points to this code. In the American Diabetes Association’s journal Clinical Diabetes, coding specialists describe E11.65 as the most commonly used code for type 2 diabetes in practice, precisely because high blood sugar is documented so often (ADA, Clinical Diabetes). The mirror-image code, for documented low blood sugar, is E11.649 (with hypoglycemia without coma) or E11.641 (with coma).

Kidney complication codes: E11.2x

Diabetes is the leading cause of chronic kidney disease, and the kidney family is one of the most used parts of E11. When E11.22 is assigned, an additional code from category N18 is required to state the kidney disease stage, from N18.1 (stage 1) through N18.6 (end-stage renal disease).

Eye complication codes: E11.3x

The eye family is the deepest in E11 because diabetic retinopathy is graded by severity. Codes from E11.31 to E11.35 are completed with extra characters: one for whether macular edema (swelling at the center of the retina) is present, and a seventh character for the eye or eyes involved. That structure produces codes such as E11.3511, proliferative diabetic retinopathy with macular edema in the right eye.

Nerve complication codes: E11.4x

Circulation complication codes: E11.5x

Skin and foot ulcer codes: E11.62x

The foot ulcer code, E11.621, is one of the most consequential in the family because diabetic foot ulcers drive a large share of diabetes hospital admissions. It is always paired with a code from L97 that identifies the ulcer’s exact site, laterality and depth, for example fat layer exposed or necrosis of muscle.

Acute metabolic codes: hyperosmolarity, ketoacidosis and hypoglycemia

Diabetic ketoacidosis is far more typical of type 1 diabetes, but it does occur in type 2, which is why E11.10 and E11.11 exist and are coded from documentation, never assumed from the diabetes type alone.

Other specified and unspecified complication codes

E11.69 deserves a note because it links diabetes to conditions that have no dedicated E11 code. A classic example is diabetes with high cholesterol: the claim carries E11.69 plus E78.2, the code for mixed hyperlipidemia, to name the associated condition. E11.8, by contrast, is a fallback: it says a complication exists but the documentation does not say which one, and coding auditors treat heavy use of it as a documentation problem.

E11.A: the remission code, new in FY2026

Effective October 1, 2025, ICD-10-CM gained E11.A, Type 2 diabetes mellitus without complications in remission. Before it existed, a person whose type 2 diabetes had gone into remission after weight loss or metabolic surgery still carried E11.9 forever, because there was no way to say “in remission” in code. E11.A follows the international consensus definition of remission: an A1C below 6.5 percent maintained for at least three months after stopping all glucose-lowering medication. Two safeguards keep it narrow. The clinician must explicitly document remission (the word “resolved” in a note is not enough, and coders are told to query if it is unclear), and an Excludes1 note makes E11.A and E11.9 mutually exclusive: a chart is one or the other, never both.

“Use additional code”: Z79.4 for insulin and the other drug codes

The E11 category carries an official instruction to add codes identifying how the diabetes is controlled. These Z codes never replace the E11 code; they ride alongside it.

The same “add a code” logic applies inside the complication families: E11.22 needs an N18 stage code, E11.621 needs an L97 ulcer code, and E11.69 needs a code naming the associated condition. A complete diabetes claim is often a small stack of codes, each adding one fact.

How coders choose the most specific code

Coders work from the clinician’s documentation, not from lab printouts, and three conventions do most of the work. Presumed linkage: for conditions the Alphabetic Index lists with the word “with” under diabetes, ICD-10-CM presumes a causal link, so kidney disease, retinopathy or neuropathy in a patient with diabetes is coded as a diabetic complication unless the clinician documents a different cause. Highest specificity: an unspecified code is acceptable only when the documentation genuinely lacks the detail; if the note says “polyneuropathy,” E11.40 (unspecified) is the wrong code and E11.42 is required. One code per complication: ICD-10-CM has no single “multiple complications” code, so each documented complication gets its own combination code.

A worked example from the ADA’s coding guidance shows the stack in action. A patient with type 2 diabetes, hyperglycemia, polyneuropathy, hypertension with protein in the urine, and mixed hyperlipidemia is coded E11.65 + E11.42 + I10 + R80.9 + E78.2: two E11 codes because two diabetes facts are documented, then one code each for the blood pressure, the urine finding and the cholesterol pattern. Note what is absent: E11.9 appears nowhere, because complication and hyperglycemia codes have replaced it.

Why your diabetes code matters as a patient

Diagnosis codes are not just bookkeeping. Insurers use them to decide whether a service matches a covered condition: continuous glucose monitors, insulin pumps, diabetes education, medical nutrition therapy and annual dilated eye exams are all approved, or denied, against the diagnosis codes on the claim. A chart stuck at a bare E11.9 while the patient actually has neuropathy or kidney disease can mean denied supplies and missed screening reminders, and in Medicare Advantage and other risk-adjusted programs the documented codes also shape the resources allocated to your care.

If a code on your portal or explanation of benefits looks wrong, you cannot edit it yourself, because codes must mirror the clinician’s documentation. The practical route is to ask the practice to review the note for that visit: if the documentation supports a more specific code, the clinician amends the record and the corrected code follows. And none of this changes day-to-day management, which still rests on the same foundations: knowing your numbers (our A1C chart explains what the result means), eating in a way that steadies glucose (see our type 2 diabetes food list), staying active and taking medication as prescribed.

The bottom line

Type 2 diabetes is coded in the E11 family: E11.9 when no complication is documented, E11.65 when hyperglycemia is, a dedicated combination code for each kidney, eye, nerve, circulation, skin or acute complication, E11.A for documented remission, and Z79.4 whenever insulin is part of long-term treatment. The code on your record is a compressed summary of what your clinician documented, and the more precise that documentation is, the better the code, and the coverage decisions built on it, will match your real condition.

This article is general information only and is not medical advice. Diagnosis codes are assigned by clinicians and certified coders from the medical record; if you believe a code on your record is wrong, ask your care team to review the documentation. It does not replace professional diagnosis or treatment.