ICD-10 Code L98.426 – Non-pressure chronic ulcer of back with bone involvement without evidence of necrosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L98.426 – Non-pressure chronic ulcer of back with bone involvement without evidence of necrosis
What it is
This code identifies a chronic, non-pressure ulcer on the back that extends to bone, but there is no documented necrosis. Use it when the record clearly shows bone involvement and the ulcer is not caused by pressure.
Clinical signs
Findings may include an open wound on the back with deep tissue loss and exposed or involved bone. Clinical features vary; refer to documentation for depth, chronicity, and whether necrosis is absent.
When to use this code
Use L98.426 when provider documentation states a chronic ulcer of the back reaches bone and is not a pressure ulcer. The note should also indicate there is no necrosis, or no necrotic tissue is described. If the site, depth, or cause is unclear, check documentation.
Do not use for
Do not use this code for pressure ulcers, ulcers without bone involvement, or ulcers with documented necrosis. If the lesion is an acute wound, abscess, or another skin condition, this code is not appropriate.
Coding tip
Verify both the anatomic site and the presence of bone involvement before assigning L98.426.