ICD-10 Code H11.023 – Central pterygium of eye, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.023 – Central pterygium of eye, bilateral
What it is
This code identifies a pterygium affecting the central part of both eyes. A pterygium is a benign fibrovascular growth of conjunctival tissue that can extend onto the cornea.
Clinical signs
Typical findings include a visible triangular or wing-shaped growth on the conjunctiva with corneal encroachment. Clinical features vary; refer to documentation for laterality and location.
When to use this code
Use H11.023 when the provider documents central pterygium in both eyes. You may also use it when the note clearly states bilateral central pterygium or equivalent wording that supports this exact diagnosis.
Check documentation if the record only mentions pterygium without location, or if laterality is unclear. Accurate coding depends on explicit bilateral and central-site documentation.
Do not use for
Do not use this code for pterygium limited to one eye, or for lesions in a different conjunctival location. Do not guess laterality or site; check documentation.
Coding tip
Confirm both the central location and bilateral involvement in the provider note before assigning H11.023.