E11 Type 2 diabetes mellitus
The ICD-10-CM code for Type 2 diabetes mellitus is E11 (FY2026). It is a non-billable category code — select a more specific code below for claims.
Classification
- Section
- E08-E13: Diabetes mellitus (E08-E13)
- Category E11
- 65 codes (48 billable)
- FY2026 Status
- Stable since FY2024
Official Coding Guidelines
Default diabetes type when not documented2) Type of diabetes mellitus not documented If the type of diabetes mellitus is not documented in the medical record the default is E11.-, Type 2 diabetes mellitus.
Use of insulin/oral/injectable drugs when type not indicated3) Diabetes mellitus and the use of insulin, oral hypoglycemics, and injectable non-insulin drugs If the documentation in a medical record does not indicate the type of diabetes but does indicate that the patient uses insulin, code E11-, Type 2 diabetes mellitus, should be assigned. Additional code(s) should be assigned from category Z79 to identify the long-term (current) use of insulin, oral hypoglycemic drugs, or injectable non-insulin antidiabetic, as follows:
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026