Central retinal vein occlusion, left eye, with macular edema

This code signifies a blockage of the main vein draining blood from the retina in the left eye, specifically complicated by swelling of the macula. This occlusion impairs blood flow, leading to retinal ischemia and fluid leakage, which manifests as macular edema and can severely impact central vision.

Apply this code when documentation confirms a diagnosis of central retinal vein occlusion affecting the left eye, and explicitly states the presence of macular edema. This is typically diagnosed via funduscopic examination, fluorescein angiography, and optical coherence tomography (OCT) showing macular thickening.

• Ensure the documentation clearly specifies "central" retinal vein occlusion, not a branch occlusion.
• Verify the laterality is explicitly stated as "left eye."
• Confirm the presence of "macular edema" as a complicating factor; if absent, a different code is required.