ICD-10 Code L97.503 – Non-pressure chronic ulcer of other part of unspecified foot with necrosis of muscle (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L97.503 – Non-pressure chronic ulcer of other part of unspecified foot with necrosis of muscle
What it is
This code identifies a chronic, non-pressure ulcer on another part of an unspecified foot with muscle necrosis. Use it when the documentation states the ulcer is not caused by pressure and extends to muscle.
Clinical signs
Typical findings include a persistent open wound on the foot with tissue loss and documented muscle necrosis. Clinical features vary; refer to documentation for ulcer location, depth, and laterality details.
When to use this code
Use L97.503 when the record clearly documents a chronic non-pressure foot ulcer involving muscle and the foot site is not more specifically identified. You should also confirm that the provider distinguishes it from a pressure injury or a more specific diabetic ulcer code. If the location is described only as “other part” of an unspecified foot, this code fits.
Do not use for
Do not use this code for pressure ulcers, acute wounds, or ulcers limited to skin or fat layer only. Check documentation if the ulcer is on a more specific foot site or if another ulcer etiology is stated.
Coding tip
Verify the ulcer depth and exact foot location before assigning L97.503, because laterality and site specificity can change the code.