ICD-10 Code L98.425 – Non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L98.425 – Non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis
What it is
This code identifies a chronic, non-pressure ulcer on the back that extends into muscle but shows no necrotic tissue. Use it when the documentation specifies both the back location and muscle involvement.
Clinical signs
Clinical features vary; refer to documentation. Typical records describe a persistent open wound on the back with deeper tissue loss reaching muscle, without mention of necrosis or gangrene.
When to use this code
Use L98.425 when the provider documents a chronic ulcer of the back and states that muscle is involved, with no evidence of necrosis. It is appropriate for non-pressure ulcers, not pressure injuries. If the depth or tissue level is unclear, check documentation before coding.
Do not use for
Do not use this code for pressure ulcers or for ulcers on other body sites. Also avoid it when necrosis is documented, because another code may be required.
Coding tip
Verify both site and depth in the note; “back” and “muscle involvement” must be explicit for correct code selection.