ICD-10 Code H11.0 – Pterygium of eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.0 – Pterygium of eye
What it is
Pterygium is a benign fibrovascular growth of conjunctival tissue that extends onto the cornea, usually from the nasal side. It can interfere with vision if it grows toward the pupil.
Clinical signs
Typical findings include a visible triangular or wing-shaped lesion on the conjunctiva, redness, irritation, and a foreign-body sensation. Clinical features vary; refer to documentation.
When to use this code
Use H11.0 when the record documents pterygium of the eye, whether newly diagnosed or longstanding. Code it for ophthalmology visits, referral notes, or problem lists that specifically identify pterygium. If the note only says “eye irritation” or “conjunctival lesion,” check documentation before assigning this code.
Do not use for
Do not use this code for pinguecula, conjunctivitis, or other nonspecific conjunctival disorders. If the provider does not clearly document pterygium, check documentation.
Coding tip
Assign H11.0 only when the diagnosis is explicit; laterality is not captured in this code, so rely on the provider’s wording.