ICD-10 Code L97.313 – Non-pressure chronic ulcer of right ankle with necrosis of muscle (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L97.313 – Non-pressure chronic ulcer of right ankle with necrosis of muscle
What it is
This code identifies a chronic, non-pressure ulcer on the right ankle with muscle necrosis. Use it when the wound is not caused by pressure and documentation confirms tissue loss extends to muscle.
Clinical signs
Expect a persistent open wound at the right ankle with visible tissue breakdown and necrosis involving muscle. Clinical features vary; refer to documentation for laterality, chronicity, and depth.
When to use this code
Use L97.313 when the provider documents a chronic ulcer of the right ankle and specifies necrosis of muscle. It is appropriate for non-pressure ulcers, including those described as longstanding or nonhealing. If the note does not clearly state depth or location, check documentation before coding.
Do not use for
Do not use this code for pressure injuries, ulcers at another site, or ulcers without muscle necrosis. Check documentation if the wound depth is only skin breakdown or if the laterality is not confirmed.
Coding tip
Verify both the exact ankle side and the deepest documented tissue involvement before assigning the code.