Ring corneal ulcer, left eye

This code signifies a ring-shaped ulceration of the cornea, specifically affecting the left eye. This type of ulcer typically involves the peripheral cornea and can be associated with various underlying inflammatory or infectious conditions.

Apply this code when documentation explicitly states a "ring corneal ulcer" in the patient's left eye. Supporting documentation should include ophthalmological examination findings confirming the characteristic ring-like morphology of the ulcer.

• Ensure laterality is clearly documented and accurately coded (left eye).
• Always look for and code any underlying cause or associated condition, such as an infectious agent or autoimmune disease, as a secondary diagnosis.
• Differentiate from other corneal ulcer types (e.g., central, marginal) based on the physician's detailed description.