Enlargement of left orbit

This code signifies an abnormal increase in the size of the bony cavity surrounding the left eyeball. This enlargement can be due to various underlying conditions, including tumors, inflammation, or vascular malformations, leading to proptosis or displacement of the globe.

Apply this code when documentation explicitly states an "enlargement of the left orbit" or "left orbital expansion." Supporting clinical findings may include imaging reports (CT, MRI) detailing increased orbital volume or measurements, and physical exam notes describing left-sided proptosis or asymmetry.

• Ensure laterality is clearly documented as "left." If bilateral, a different code (H05.343) is required.
• Do not confuse with exophthalmos (R68.2), which describes the protrusion of the eyeball itself, though often a symptom of orbital enlargement.
• Always code the underlying cause of the orbital enlargement if known and documented (e.g., orbital tumor, thyroid eye disease).