Peripheral pterygium, progressive, unspecified eye

This code describes a progressive growth of conjunctival tissue onto the cornea, originating from the limbus, in an unspecified eye. This abnormal tissue can obstruct vision and cause irritation as it advances across the corneal surface. The "progressive" aspect indicates ongoing growth and potential for visual impairment.

This code is appropriate when documentation indicates a pterygium that is actively growing or has shown signs of enlargement over time, and the affected eye is not specified (e.g., "progressive pterygium"). It should be used when the physician explicitly notes the progressive nature of the pterygium.

• Ensure documentation clearly states the pterygium is "progressive" to support this specific code.
• Avoid using this code if the laterality (right or left eye) is documented; instead, select the more specific code.
• Do not use this code for stable or non-progressive pterygia; those have different code assignments.