ICD-10 Code L89.104 – Pressure ulcer of unspecified part of back, stage 4 (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L89.104 – Pressure ulcer of unspecified part of back, stage 4
What it is
This code identifies a stage 4 pressure ulcer on an unspecified area of the back. Stage 4 means full-thickness skin and tissue loss, with exposed deeper structures such as muscle, tendon, or bone.
Clinical signs
You may see a deep open wound, undermining, or tunneling, with visible or palpable deeper tissue. Clinical features vary; refer to documentation for the exact back location and stage confirmation.
When to use this code
Use this code when the record clearly documents a pressure ulcer on the back, but the exact back site is not specified, and the ulcer is stage 4. It is appropriate for inpatient, outpatient, or wound-care documentation when staging is supported. Confirm that the pressure injury is present on the back and not another body site.
Do not use for
Do not use this code if the ulcer is on a different body area, if the stage is not documented as 4, or if documentation is unclear. Check documentation.
Coding tip
Verify both the stage and the unspecified back location before assigning L89.104.