ICD-10 Code H21.1 – Other vascular disorders of iris and ciliary body (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.1 – Other vascular disorders of iris and ciliary body
What it is
Use this code for vascular abnormalities affecting the iris or ciliary body that are not classified elsewhere. It covers disorders involving abnormal blood vessels in these anterior eye structures.
Clinical signs
Findings may include visible abnormal iris vessels, ocular redness, or signs of anterior segment vascular change. Clinical features vary; refer to documentation.
When to use this code
Use H21.1 when the provider documents a vascular disorder of the iris or ciliary body and does not name a more specific diagnosis. It may apply when the record describes abnormal vascularity, neovascular change, or another coded eye condition involving these structures. Check documentation if the note is unclear.
Do not use for
Do not use this code for general eye inflammation, trauma, or retinal vascular disease. If the condition is better described by another eye diagnosis, code that instead.
Coding tip
Look for the exact anatomic site and whether the provider specifies a more precise vascular diagnosis before assigning H21.1.