ICD-10 Code H11.059 – Peripheral pterygium, progressive, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.059 – Peripheral pterygium, progressive, unspecified eye
What it is
This code identifies a progressive peripheral pterygium in an unspecified eye. It is a fibrovascular growth of conjunctival tissue extending toward the cornea, but the record does not specify which eye.
Clinical signs
Typical findings include a fleshy, wing-shaped conjunctival lesion that advances toward the cornea and may cause irritation or redness. Clinical features vary; refer to documentation.
When to use this code
Use H11.059 when the provider documents a progressive peripheral pterygium and does not name the right or left eye. It also fits charted cases where the lesion is described as advancing toward the cornea without further laterality detail. Check documentation if the note only says pterygium without progression.
Do not use for
Do not use this code for pterygium with documented laterality, because a more specific code may apply. Do not use it for pinguecula or other conjunctival lesions that are not pterygium.
Coding tip
If the eye is not identified, code the unspecified-eye option only after confirming the documentation does not support laterality.