ICD-10 Code E10.621 – Type 1 diabetes mellitus with foot ulcer (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E10.621 – Type 1 diabetes mellitus with foot ulcer
What it is
E10.621 identifies type 1 diabetes mellitus complicated by a foot ulcer. Use it when the record links the ulcer to the patient’s type 1 diabetes and the ulcer is on the foot.
Clinical signs
Typical findings include an open ulcer on the foot in a patient with type 1 diabetes. Clinical features vary; refer to documentation for ulcer location, depth, and whether infection or other complications are present.
When to use this code
Use this code when the provider documents type 1 diabetes with a foot ulcer, or clearly states the ulcer is diabetic in origin. You should code the diabetes and ulcer relationship as documented. If the site is not clearly the foot, or the cause is uncertain, check documentation.
Do not use for
Do not use this code for type 2 diabetes with foot ulcer, which requires a different code. Do not use it for foot ulcers without a documented link to type 1 diabetes.
Coding tip
Confirm both the diabetes type and the ulcer site in the note before assigning E10.621.