Non-pressure chronic ulcer of back with fat layer exposed

This code signifies a persistent, non-pressure-related open sore on the patient's back where the subcutaneous fat tissue is visible. It indicates a full-thickness skin defect extending beyond the dermis into the adipose layer, not caused by sustained pressure.

Apply this code when documentation clearly states a chronic ulcer on the back, explicitly noting that the fat layer is exposed, and ruling out pressure as the etiology. This is typically seen in conditions like venous stasis ulcers, arterial ulcers, or neuropathic ulcers occurring on the back.

• Differentiate carefully between "fat layer exposed" and "muscle exposed" (L98.432) or "bone exposed" (L98.442).
• Ensure the documentation specifies "chronic" and "non-pressure" to avoid miscoding acute ulcers or pressure ulcers.
• Always sequence this code after any underlying systemic condition causing the ulcer, such as diabetes (E11.621) or peripheral vascular disease (I70.2-).