Degeneration of iris (pigmentary), unspecified eye

This code describes a condition where the iris, the colored part of the eye, undergoes degenerative changes, specifically pigmentary degeneration. This can involve the loss or dispersion of pigment from the iris, potentially affecting its structure and function. It indicates that the specific eye affected (left or right) is not documented.

Use this code when documentation indicates "degeneration of iris, pigmentary type" without specifying laterality. This diagnosis is typically made by an ophthalmologist based on slit-lamp examination findings. Supporting documentation should clearly state the diagnosis of pigmentary iris degeneration.

• Only use this code when the medical record does not specify whether the degeneration is in the right or left eye.
• If laterality is documented, use the more specific codes H21.231 (right eye) or H21.232 (left eye).
• Distinguish from other iris disorders like atrophy or cysts, which have different ICD-10-CM codes.