Retinopathy of prematurity, stage 2, left eye

This code identifies a specific stage of abnormal blood vessel development in the retina of a premature infant's left eye. Stage 2 retinopathy of prematurity (ROP) is characterized by the presence of a raised, thick, white ridge separating the vascularized and avascular retina, with some extraretinal fibrovascular proliferation.

Assign this code when documentation confirms a diagnosis of Stage 2 ROP affecting the left eye. This diagnosis is typically made by an ophthalmologist during a retinal examination of a premature infant. Supporting documentation should clearly specify the stage of ROP and the affected eye.

• Ensure the medical record explicitly states "Stage 2" and "left eye" for accurate code assignment.
• Do not confuse with other stages of ROP (e.g., H35.12- for Stage 1, H35.14- for Stage 3).
• Laterality is crucial; use H35.131 for the right eye and H35.133 for bilateral involvement.