ICD-10 Code L98.413 – Non-pressure chronic ulcer of buttock with necrosis of muscle (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L98.413 – Non-pressure chronic ulcer of buttock with necrosis of muscle
What it is
This code identifies a chronic, non-pressure ulcer on the buttock with necrosis of muscle. Use it when documentation shows a full-thickness ulcer with muscle death, and the wound is not caused by pressure.
Clinical signs
Typical findings include an open buttock wound that is slow to heal, with exposed or destroyed muscle tissue. Clinical features vary; refer to documentation for depth, laterality, and whether necrosis is present.
When to use this code
Use L98.413 when the record clearly states a chronic ulcer of the buttock and specifies necrosis of muscle. It is appropriate for non-pressure ulcers, including wounds documented as chronic, nonhealing, or full-thickness. If the note does not confirm muscle necrosis, check documentation.
Do not use for
Do not use this code for pressure ulcers, superficial skin breakdown, or ulcers without muscle necrosis. If the cause, depth, or site is unclear, check documentation before coding.
Coding tip
Verify that the ulcer is non-pressure and that muscle necrosis is explicitly documented before assigning L98.413.