ICD-10 Code E10 – Type 1 diabetes mellitus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E10 – Type 1 diabetes mellitus
What it is
E10 identifies type 1 diabetes mellitus, a chronic disorder in which the pancreas makes little or no insulin. Use it when documentation clearly states type 1 diabetes or insulin-dependent diabetes.
Clinical signs
Clinical features vary; refer to documentation. Common findings include hyperglycemia, increased thirst, frequent urination, weight loss, and a need for ongoing insulin therapy.
When to use this code
Use E10 when the provider documents type 1 diabetes mellitus without a more specific complication code. It may also apply when records describe autoimmune or insulin-dependent diabetes and do not indicate type 2 or another type. If complications are documented, code those conditions as instructed.
Do not use for
Do not use E10 for type 2 diabetes, gestational diabetes, or diabetes due to another cause. If the chart is unclear, check documentation rather than assuming type 1.
Coding tip
Verify the diabetes type and any documented complications before assigning E10.