Peripheral pterygium, progressive, right eye

This code signifies a progressive growth of conjunctival tissue onto the cornea in the right eye, specifically a pterygium that is actively enlarging. This condition can lead to visual impairment, irritation, and astigmatism as it encroaches further onto the corneal surface.

Apply this code when documentation clearly indicates a pterygium in the right eye that is noted as "progressive," "growing," "enlarging," or requiring intervention due to its advancement. This code is appropriate for initial diagnoses and follow-up encounters where progression is observed or managed.

• Ensure documentation specifies "progressive" to differentiate from non-progressive pterygia.
• Laterality (right eye) must be clearly documented; do not use for left or bilateral involvement.
• Distinguish from pinguecula, which is a similar but non-invasive conjunctival growth.