Pyoderma gangrenosum

This code represents pyoderma gangrenosum, a rare, inflammatory, ulcerative skin condition characterized by rapidly enlarging, painful ulcers with undermined, violaceous borders. It is often associated with systemic diseases such as inflammatory bowel disease, rheumatoid arthritis, or hematologic malignancies, but can also occur without an underlying cause.

Use this code when documentation clearly identifies a diagnosis of pyoderma gangrenosum. This diagnosis is typically made clinically based on the characteristic appearance of the skin lesions and exclusion of other causes of ulceration, often supported by biopsy findings.

• Differentiate from other ulcerative skin conditions; ensure the provider's documentation specifically states "pyoderma gangrenosum."
• Do not code concurrently with L08.0 (dermatitis gangrenosa) due to the Excludes1 note, as these are distinct conditions.
• Code any associated systemic conditions (e.g., inflammatory bowel disease, rheumatoid arthritis) as secondary diagnoses to provide a complete clinical picture.