ICD-10 Code L97.404 – Non-pressure chronic ulcer of unspecified heel and midfoot with necrosis of bone (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L97.404 – Non-pressure chronic ulcer of unspecified heel and midfoot with necrosis of bone
What it is
This code identifies a chronic, non-pressure ulcer on an unspecified heel or midfoot with bone necrosis. Use it when the documentation confirms the ulcer location and that the bone is involved.
Clinical signs
Findings usually include a persistent open wound in the heel or midfoot with exposed or necrotic bone. Clinical features vary; refer to documentation for depth, laterality, and evidence of chronicity.
When to use this code
Use L97.404 when the record states a chronic non-pressure ulcer of the heel or midfoot and specifies necrosis of bone, but does not identify right or left side. It is appropriate for outpatient, inpatient, or wound-care documentation when the ulcer is clearly non-pressure related.
If the note only says “ulcer” without chronicity, site, or bone involvement, check documentation before coding. Make sure the provider distinguishes this from pressure injuries or ulcers at other foot locations.
Do not use for
Do not use this code for pressure ulcers, diabetic foot ulcers without the required documentation, or ulcers of the toe, ankle, or other sites. Check documentation if laterality is known, because unspecified site coding may be incorrect.
Coding tip
Confirm three elements in the note: non-pressure cause, heel or midfoot location, and bone necrosis.