Transient retinal artery occlusion, right eye

This code signifies a temporary blockage of blood flow to the retina in the right eye, leading to sudden, often transient, vision loss. It is a form of acute retinal ischemia, where the retinal tissue experiences a brief period of oxygen deprivation due to arterial obstruction.

Apply this code when documentation explicitly states a diagnosis of transient retinal artery occlusion affecting the right eye. This typically involves a patient presenting with sudden, painless monocular vision loss that resolves spontaneously within minutes to hours, often described as a "amaurosis fugax" event. Support for this diagnosis includes ophthalmological examination findings consistent with retinal ischemia and a history of transient visual disturbance.

• Ensure laterality is clearly documented as "right eye" to support this specific code.
• Distinguish from permanent retinal artery occlusions (e.g., central or branch retinal artery occlusion), which have different code assignments.
• Consider coding associated underlying systemic conditions, such as carotid artery disease or cardiac emboli, as secondary diagnoses if documented as causative factors.