Other iris atrophy

This code represents the degeneration or thinning of the iris tissue from causes other than essential or senile atrophy. It encompasses various forms of iris atrophy that do not fit into more specific categories, often leading to changes in pupil shape, transillumination defects, and potential visual disturbances.

Use this code when documentation specifies iris atrophy that is not congenital, senile, or essential, and the specific type is not otherwise classifiable. This includes atrophy secondary to trauma, inflammation, or other underlying ocular conditions when a more precise code for the specific type of atrophy is unavailable. Documentation should clearly state "other iris atrophy" or describe an unclassified form of iris atrophy.

• Do not use this code for essential (progressive) iris atrophy (H21.21x) or senile iris atrophy (H21.22).
• Always look for more specific codes within the H21.2 subcategory if the type of iris atrophy is clearly documented.
• Code any underlying cause or associated condition of the iris atrophy, such as trauma or inflammation, if documented and clinically relevant.