ICD-10 Code H11.009 – Unspecified pterygium of unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.009 – Unspecified pterygium of unspecified eye
What it is
This code identifies a pterygium when the chart does not specify which eye is affected or provide a more detailed subtype. A pterygium is a benign conjunctival growth that can extend onto the cornea.
Clinical signs
Typical findings include a visible triangular fibrovascular growth on the conjunctiva, often arising near the inner or outer corner of the eye. Clinical features vary; refer to documentation.
When to use this code
Use H11.009 when the provider documents pterygium but does not state right, left, or bilateral eye involvement. It also fits when the record confirms pterygium but leaves laterality unspecified. If the note gives a more specific eye or type, code that detail instead.
Do not use for
Do not use this code for pinguecula, conjunctivitis, or other conjunctival lesions without pterygium. Do not use it when the documentation identifies a specific eye or a different pterygium code applies.
Coding tip
Check the ophthalmology note for laterality before assigning H11.009.