ICD-10 Code E13 – Other specified diabetes mellitus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E13 – Other specified diabetes mellitus
What it is
E13 identifies diabetes mellitus that does not fit the common type 1 or type 2 categories. Use it when the record specifies another cause or form of diabetes, but not more detail.
Clinical signs
Clinical features vary; refer to documentation. Patients may show typical diabetes findings such as hyperglycemia, polyuria, polydipsia, or weight change, but the key issue is the documented nonstandard diabetes type.
When to use this code
Use E13 when the provider documents a specified diabetes type outside the usual categories, and no more specific code applies. It may appear in records describing diabetes due to another identified condition or a distinct diabetes form. Check documentation for the exact etiology and any associated manifestations.
Do not use for
Do not use E13 for routine type 1 or type 2 diabetes, or when the record only says “diabetes” without further specification. If the documentation supports a more specific diabetes code, use that instead.
Coding tip
Code the documented diabetes type first, then add any associated complications or manifestations only when the record supports them.