Iris atrophy (essential) (progressive), unspecified eye

This code describes the degeneration or wasting away of the iris tissue, which is the colored part of the eye responsible for controlling pupil size. This atrophy can be either essential (primary, without an identifiable cause) or progressive, leading to changes in pupil shape and function.

Use this code when documentation indicates iris atrophy without specifying laterality (right or left eye). This diagnosis is often made during an ophthalmologic examination revealing thinning or holes in the iris. Supporting documentation would include ophthalmologist notes detailing the findings of iris atrophy.

• Ensure the documentation explicitly states "unspecified eye" or does not specify laterality. If laterality is known, a more specific code should be used.
• Differentiate from other iris disorders like iritis or iridocyclitis, which involve inflammation rather than atrophy.
• Review the patient's history for underlying conditions that might contribute to iris atrophy, such as trauma or glaucoma, and code those conditions separately if present.