ICD-10 Code L98.412 – Non-pressure chronic ulcer of buttock with fat layer exposed (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L98.412 – Non-pressure chronic ulcer of buttock with fat layer exposed
What it is
This code identifies a chronic, non-pressure ulcer on the buttock that extends into the subcutaneous fat layer. Use it when the record clearly states fat layer exposure and the ulcer is not caused by pressure.
Clinical signs
Typical documentation may note an open wound on the buttock with visible or exposed fat tissue. Clinical features vary; refer to documentation for ulcer depth, laterality, and whether infection or necrosis is present.
When to use this code
Use L98.412 when the provider documents a chronic ulcer of the buttock and specifies exposure of the fat layer. This is appropriate for non-pressure ulcers, including wounds described as chronic, non-healing, or full-thickness to subcutaneous tissue. Check documentation if the cause is unclear or if pressure injury is mentioned.
Do not use for
Do not use this code for pressure ulcers, skin tears, or superficial wounds limited to the epidermis or dermis. If the ulcer site, depth, or etiology is not documented, check documentation.
Coding tip
Confirm that the record says “non-pressure” and “fat layer exposed” before assigning L98.412.