ICD-10 Code L98.422 – Non-pressure chronic ulcer of back with fat layer exposed (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L98.422 – Non-pressure chronic ulcer of back with fat layer exposed
What it is
This code identifies a chronic skin ulcer on the back that is not caused by pressure and extends through the skin to expose subcutaneous fat. Use it when the record clearly states a non-pressure ulcer of the back with fat layer exposed.
Clinical signs
Findings usually include a persistent open wound on the back with full-thickness skin loss and visible fat. Clinical features vary; refer to documentation for ulcer chronicity, location, and depth.
When to use this code
Use L98.422 when the provider documents a chronic non-pressure ulcer on the back and specifies exposed fat layer. This may appear in wound care notes, progress notes, or discharge summaries. If the site, depth, or chronic nature is unclear, check documentation before coding.
Do not use for
Do not use this code for pressure ulcers, superficial skin breakdown, or ulcers at another body site. If the ulcer depth is not documented as exposing fat, choose the more specific documented code or check documentation.
Coding tip
Verify both the anatomic site and the depth; “back” and “fat layer exposed” must both be documented.