ICD-10 Code L88 – Pyoderma gangrenosum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L88 – Pyoderma gangrenosum
What it is
L88 identifies pyoderma gangrenosum, a rare inflammatory skin disorder that causes painful ulcerative lesions. It is not an infection, despite the name, and documentation should reflect the diagnosis clearly.
Clinical signs
Typical findings include rapidly enlarging, painful ulcers with undermined, violaceous borders. Lesions may begin as pustules, nodules, or papules and can worsen after minor trauma; clinical features vary, so refer to documentation.
When to use this code
Use L88 when the provider documents pyoderma gangrenosum as the confirmed diagnosis. Apply it for active ulcerative disease, including cases described as chronic or recurrent, when the chart supports that specific condition.
Do not assign it for an unspecified skin ulcer, cellulitis, or another inflammatory dermatosis unless pyoderma gangrenosum is explicitly documented. If the note is unclear, check documentation before coding.
Do not use for
Do not use L88 for infectious skin ulcers, simple wound breakdown, or traumatic ulcers. It is also inappropriate when the record only says “skin lesion” or “ulcer” without naming pyoderma gangrenosum.
Coding tip
Code L88 only when the provider states pyoderma gangrenosum; if the diagnosis is uncertain, query for clarification.