Partial retinal artery occlusion, unspecified eye

This code signifies a blockage affecting a portion of the retinal artery, leading to reduced blood flow to the retina in an unspecified eye. This partial occlusion can result in sudden, painless vision loss or visual field defects. The "unspecified eye" designation indicates that the medical record does not specify whether the right or left eye is affected.

Use this code when documentation clearly states a diagnosis of partial retinal artery occlusion but does not specify the affected eye. This is appropriate for cases where the physician has not indicated laterality, or when the condition is bilateral but the specific laterality for each eye is not separately documented.

• Avoid using this code if the medical record specifies laterality (e.g., right eye, left eye, bilateral); instead, use the more specific H34.211 or H34.212.
• Ensure documentation supports a partial occlusion; complete occlusions are coded differently (H34.1-).
• Always query the provider for laterality if it's missing, as more specific codes are preferred.