ICD-10 Code L97.913 – Non-pressure chronic ulcer of unspecified part of right lower leg with necrosis of muscle (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L97.913 – Non-pressure chronic ulcer of unspecified part of right lower leg with necrosis of muscle
What it is
This code identifies a chronic non-pressure ulcer on the right lower leg when the exact site is not specified and the wound extends into muscle tissue. Use it when documentation clearly states necrosis of muscle.
Clinical signs
Typical findings include a persistent open wound on the lower leg with tissue loss and exposed or necrotic muscle. Clinical features vary; refer to documentation for laterality, depth, and whether the ulcer is non-pressure in origin.
When to use this code
Use L97.913 when the record describes a chronic ulcer of the right lower leg, does not identify a more specific subsite, and confirms muscle necrosis. It is appropriate when the ulcer is not caused by pressure and the depth is documented at the muscle level.
If the note only says “ulcer” or does not specify laterality, location, or depth, check documentation before assigning this code. Make sure you are not coding a pressure injury or a more specific lower-leg ulcer code.
Do not use for
Do not use this code for pressure ulcers, ulcers of the foot or ankle, or ulcers without documented muscle necrosis. Do not assume the site or depth if the chart is unclear.
Coding tip
Confirm three elements in the note: right lower leg, non-pressure etiology, and necrosis of muscle; if any are missing, check documentation.