H21.521: Goniosynechiae, right eye
H21.521 is the billable ICD-10-CM diagnosis code for Goniosynechiae, right eye. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code H21.521?
H21.521 is the ICD-10-CM diagnosis code for Goniosynechiae, right eye. It belongs to category H21 (Other disorders of iris and ciliary body).
Is H21.521 a billable code?
Yes. H21.521 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does H21.521 belong to?
H21.521 is part of ICD-10-CM category H21 — Other disorders of iris and ciliary body, which has 194 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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