Peripheral pterygium, progressive, left eye

This code represents a non-cancerous growth of the conjunctiva that extends onto the cornea, specifically in the left eye, and is actively enlarging or worsening. This progressive nature indicates that the pterygium is invading the cornea and potentially affecting vision.

Use this code when documentation clearly indicates a pterygium affecting the left eye that is noted as "progressive," "growing," "enlarging," or showing signs of active corneal invasion. This typically applies to patients presenting with increasing irritation, vision changes, or documented growth over time.

• Ensure the documentation explicitly states "progressive" or provides clinical evidence of growth for accurate coding.
• Distinguish from non-progressive pterygium (H11.01-) or pterygium of unspecified progression (H11.00-).
• Laterality is crucial; confirm "left eye" is documented.