Diffuse secondary atrophy of choroid, right eye

This code signifies a widespread thinning and degeneration of the choroid in the right eye, occurring as a consequence of another underlying ocular or systemic condition. This atrophy leads to a reduction in the choroid's normal thickness and vascularity, potentially impacting retinal function.

Apply this code when documentation explicitly states "diffuse secondary choroidal atrophy" affecting the right eye. This diagnosis is typically made following ophthalmoscopic examination, OCT imaging, or fluorescein angiography, revealing widespread choroidal thinning secondary to conditions like high myopia, inflammatory chorioretinopathies, or certain retinal dystrophies.

• Ensure documentation specifies "diffuse" and "secondary" to differentiate from localized or primary choroidal atrophy.
• Always code the underlying primary condition causing the secondary atrophy first, if known and actively treated.
• Verify laterality; this code is specific to the right eye. Use H31.122 for the left eye and H31.123 for bilateral involvement.