Type 2 diabetes ICD-10 code
The ICD-10-CM code for type 2 diabetes is E11.9 (type 2 diabetes mellitus without complications). It is billable and valid for submission on a claim. There are 16 related codes, and which one you use depends on what the documentation supports.
Also written as dm2, t2dm, diabetes mellitus type 2.
The mistake coders make here
E11.9 means WITHOUT complications. ICD-10-CM presumes a link between diabetes and a condition when the note says 'with', 'due to', or 'diabetic', so a documented complication usually means a combination code, not E11.9 plus a separate code.
Putting type 2 diabetes on a claim? Check the claim’s diagnosis codes free: Excludes1 conflicts, header codes and missing seventh characters, before it goes out.
ICD-10-CM codes for type 2 diabetes
15 of 16 are billable. Green means you can submit it as-is.
| Code | Use it when |
|---|---|
| E11.9 | Type 2 diabetes mellitus without complications |
| E11.65 | Type 2 diabetes mellitus with hyperglycemia |
| E11.22 | Type 2 diabetes mellitus with diabetic chronic kidney disease |
| E11.21 | Type 2 diabetes mellitus with diabetic nephropathy |
| E11.42 | Type 2 diabetes mellitus with diabetic polyneuropathy |
| E11.A | Type 2 diabetes mellitus without complications in remission |
| E11.630 | Type 2 diabetes mellitus with periodontal disease |
| E11.641 | Type 2 diabetes mellitus with hypoglycemia with coma |
| E11.628 | Type 2 diabetes mellitus with other skin complications |
| E11.638 | Type 2 diabetes mellitus with other oral complications |
| E11.649 | Type 2 diabetes mellitus with hypoglycemia without coma |
| O24.11 | Pre-existing type 2 diabetes mellitus, in pregnancynot billable on its own |
| O24.12 | Pre-existing type 2 diabetes mellitus, in childbirth |
| O24.13 | Pre-existing type 2 diabetes mellitus, in the puerperium |
| E11.3553 | Type 2 diabetes mellitus with stable proliferative diabetic retinopathy, bilateral |
| O24.111 | Pre-existing type 2 diabetes mellitus, in pregnancy, first trimester |
Not sure which one? Let the documentation decide.
Answer a few questions about what the chart actually says and we’ll walk you to the code that follows from it.
Once you have the code
- Check the whole claim: Excludes1 conflicts and missing seventh characters, free
- Denial codes explained: what CO-16, CO-97 and the rest actually mean
- Decision guides: walk a chart note to a code, guideline cited
- Everything here that is free, and the one thing no free tool includes
'With' means a combination code, not E11.9 plus something
The Official Guidelines (Section I.C.4.a and the 'with' convention in I.A.15) presume a causal relationship between diabetes and any condition listed under 'with' in the Alphabetic Index, unless the provider documents they are unrelated. So diabetes and CKD is E11.22 plus the N18.- stage; diabetes and polyneuropathy is E11.42; diabetes and retinopathy is E11.3- to the laterality and severity; diabetes with peripheral angiopathy is E11.51 (E11.52 with gangrene). E11.9 is reserved for type 2 diabetes with no documented complication at all. E11.65 is diabetes with hyperglycaemia and is what 'uncontrolled' or 'poorly controlled' with a high glucose indexes to; hypoglycaemia is E11.649 (E11.641 with coma).
The long-term drug codes changed in FY2023
Z79.4 is long-term insulin use, Z79.84 is long-term oral hypoglycaemic use, and since 1 October 2022 Z79.85 covers injectable non-insulin drugs such as GLP-1 agonists. The old rule that insulin alone was coded when a patient used both insulin and an oral agent was withdrawn at the same time: report every class the patient is on. These codes are not assigned for temporary insulin given to bring blood sugar under control during an admission. Type unspecified defaults to E11; secondary diabetes due to another condition is E08, drug- or chemical-induced is E09, and other specified types (including post-pancreatectomy and MODY) are E13.
Remission, insulin pump failures and the pregnant patient
E11.A, type 2 diabetes mellitus without complications in remission, was added in FY2025 for the patient whose provider documents remission: it is not assigned on a coder's reading of a normal A1c. Underdosing from an insulin pump failure is T85.614- (mechanical breakdown) with T38.3X6- for the underdosing and the diabetes code; overdosing from a pump is T85.614- with T38.3X1-. Pre-existing type 2 diabetes in pregnancy is O24.11- first with the E11.- code second; gestational diabetes is O24.4- and is never E11.
Common questions
- What is the ICD-10 code for type 2 diabetes without complications?
- E11.9. Use it only when no diabetic complication is documented; if the note links diabetes to CKD, neuropathy, retinopathy or another condition with 'with', 'due to' or 'diabetic', a combination code from E11.2- to E11.6- applies instead.
- What is the ICD-10 code for uncontrolled type 2 diabetes?
- 'Uncontrolled' is not a code on its own. With hyperglycaemia it is E11.65; with hypoglycaemia it is E11.649 (E11.641 if with coma). Query if the note says uncontrolled without saying which direction.
- Do I code both Z79.4 and Z79.84 when a patient takes insulin and metformin?
- Yes. Since FY2023 every class of long-term diabetes medication is reported: Z79.4 insulin, Z79.84 oral hypoglycaemics, Z79.85 injectable non-insulin agents such as GLP-1s.