ICD-10 Code L97.204 – Non-pressure chronic ulcer of unspecified calf with necrosis of bone (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L97.204 – Non-pressure chronic ulcer of unspecified calf with necrosis of bone
What it is
This code identifies a chronic ulcer on the calf that is not caused by pressure and has exposed or destroyed bone. Use it when documentation specifies the calf location but does not state right or left.
Clinical signs
Typical findings include a persistent open wound on the calf with necrotic tissue and bone involvement. Clinical features vary; refer to documentation for laterality, depth, and whether infection is present.
When to use this code
Use L97.204 when the provider documents a non-pressure chronic ulcer of the calf with necrosis of bone and does not specify which calf. It fits chronic wounds described as nonhealing, full-thickness, or involving bone. Check documentation if the record also mentions pressure injury or another ulcer site.
Do not use for
Do not use this code for pressure ulcers, acute wounds, or ulcers at other leg locations. If the documentation names the right or left calf, choose the more specific code instead.
Coding tip
Verify that the note clearly supports bone necrosis and an unspecified calf before assigning L97.204.