Secondary pigmentary degeneration, left eye

This code signifies a secondary form of pigmentary degeneration affecting the retina of the left eye. This condition involves the abnormal accumulation or loss of pigment within the retinal layers, which is a consequence of another underlying ocular or systemic disease rather than a primary inherited retinal dystrophy. It can lead to visual impairment, including night blindness and peripheral vision loss.

Apply this code when documentation clearly indicates pigmentary changes in the left retina that are secondary to a known cause, such as inflammation, trauma, or vascular disease. The physician's notes should specify "secondary" and clearly identify the left eye as the affected side. This code is appropriate when the primary cause of the degeneration is also documented and coded.

• Always ensure documentation specifies "secondary" to differentiate from primary pigmentary degenerations (e.g., retinitis pigmentosa).
• Confirm laterality (left eye) is explicitly stated; do not assume.
• Code the underlying primary condition that led to the secondary pigmentary degeneration first, followed by this code.