ICD-10 Code H11.021 – Central pterygium of right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.021 – Central pterygium of right eye
What it is
H11.021 identifies a pterygium located in the central area of the right eye. It is a fibrovascular growth of conjunctival tissue that extends onto the cornea.
Clinical signs
Typical findings include a visible triangular or wing-shaped conjunctival growth crossing the limbus onto the cornea. Clinical features vary; refer to documentation for laterality and exact location.
When to use this code
Use H11.021 when the record clearly documents a central pterygium affecting the right eye. You should code it when the provider specifies the site and laterality, even if the condition is incidental. If the note only says “pterygium” or does not confirm the right eye, check documentation.
Do not use for
Do not use this code for pterygium of the left eye, unspecified eye, or a lesion that is not documented as central. Do not assign it when the diagnosis is unclear or the chart uses a different conjunctival disorder.
Coding tip
Verify both laterality and the central location in the provider note before assigning H11.021.