ICD-10 Code L97.402 – Non-pressure chronic ulcer of unspecified heel and midfoot with fat layer exposed (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L97.402 – Non-pressure chronic ulcer of unspecified heel and midfoot with fat layer exposed
What it is
This code describes a chronic ulcer on the heel or midfoot that is not caused by pressure and extends through the skin into the fat layer. You use it when the site is unspecified and the wound is documented as having exposed subcutaneous tissue.
Clinical signs
Typical findings include a persistent open wound with visible fat, delayed healing, and surrounding skin changes such as drainage or inflammation. Clinical features vary; refer to documentation.
When to use this code
Use L97.402 when the record identifies a chronic non-pressure ulcer of the heel or midfoot, but does not specify left or right side. The documentation must also support fat layer exposure. If the note only says “ulcer” without depth or location details, check documentation.
Do not use for
Do not use this code for pressure ulcers, traumatic wounds, or ulcers at other foot sites. It is also incorrect if the ulcer depth is not documented as reaching the fat layer.
Coding tip
Confirm both the anatomic site and the ulcer depth before assigning L97.402.