ICD-10 Code H21.503 – Unspecified adhesions of iris, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.503 – Unspecified adhesions of iris, bilateral
What it is
H21.503 identifies adhesions involving both irises, but the record does not specify the exact type or cause. Use it when the documentation confirms bilateral iris adhesions without further detail.
Clinical signs
Clinical features vary; refer to documentation. Eye findings may include abnormal iris attachment, distorted pupil shape, or reduced iris mobility on examination.
When to use this code
Use this code when the provider documents bilateral iris adhesions and does not identify them as posterior synechiae, anterior synechiae, or another specific form. It also fits cases where laterality is bilateral but the adhesion detail remains unspecified. Check documentation for the exact ophthalmic wording.
Do not use for
Do not use this code if the record names a more specific iris adhesion type or only one eye is involved. If the diagnosis is unclear or undocumented, check documentation rather than assuming H21.503.
Coding tip
Match the code to the provider’s exact wording; “unspecified” should be coded only when no more specific iris adhesion term is documented.