Pressure ulcer of unspecified part of back, stage 4

This code signifies a severe pressure injury located on an unspecified area of the patient's back, characterized by full-thickness tissue loss. This stage involves exposed bone, tendon, or muscle, often with slough or eschar present, and may include undermining and tunneling.

Apply this code when documentation clearly indicates a stage 4 pressure ulcer on any part of the back (e.g., thoracic, lumbar, sacral) without further specification of the exact anatomical site. This code is appropriate when the deepest tissue layer involved is bone, tendon, or muscle.

• Ensure the documentation explicitly states "stage 4" and specifies the back as the location, even if unspecified further.
• Do not use this code if the specific anatomical site on the back (e.g., sacrum, coccyx) is documented; use the more specific code.
• Always sequence this code after any underlying condition that contributed to the pressure ulcer, if applicable.