Diffuse secondary atrophy of choroid, left eye

This code signifies a widespread thinning and degeneration of the choroid layer in the left eye, which is a secondary consequence of another underlying ocular or systemic condition. This atrophy results in a compromised blood supply to the retina, potentially leading to visual impairment.

Apply this code when documentation clearly indicates diffuse atrophy of the choroid in the left eye, explicitly stating it is secondary to another condition. Supporting documentation would include ophthalmological exam findings, imaging reports (e.g., OCT, fluorescein angiography), and a confirmed primary diagnosis leading to the choroidal changes.

• Ensure the documentation specifies "diffuse" and "secondary" atrophy of the choroid.
• Always code the underlying primary condition causing the secondary choroidal atrophy first.
• Verify laterality; this code is specific to the left eye. Do not use for bilateral or right eye involvement.