ICD-10 Code H21 – Other disorders of iris and ciliary body (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21 – Other disorders of iris and ciliary body
What it is
H21 covers disorders affecting the iris or ciliary body that are not classified elsewhere. Use it when the record describes a non-specific or other specified condition involving these anterior eye structures.
Clinical signs
Clinical features vary; refer to documentation. Findings may include iris abnormalities, ciliary body involvement, eye pain, redness, or visual disturbance, depending on the exact disorder.
When to use this code
Use H21 when the provider documents an “other” disorder of the iris or ciliary body and no more specific ICD-10-CM code applies. It may fit cases with structural or inflammatory involvement of these tissues when the exact diagnosis is not further defined. Check documentation for laterality or associated eye conditions if reported.
Do not use for
Do not use H21 if the record identifies a more specific iris or ciliary body diagnosis, such as a coded inflammatory or congenital condition. Do not assign it for general eye symptoms without a documented disorder.
Coding tip
Code the most specific documented eye disorder first; use H21 only when the chart clearly says “other” or an unspecified iris/ciliary body condition.