L89.94
BillablePressure ulcer of unspecified site, stage 4
HCC Category Mapping
V28HCC 379 — Pressure Ulcer of Skin with Full Thickness Skin Loss
0.662V24HCC 157 — Pressure Ulcer of Skin with Necrosis Through to Muscle, Tendon, or Bone
1.071ESRDHCC 157 — Pressure Ulcer of Skin with Necrosis Through to Muscle, Tendon, or Bone
0.000What This Code Means
A stage 4 pressure ulcer on an unspecified body location, the most severe stage involving full-thickness skin loss with exposure of bone, tendon, or muscle.
Coding Tips
- •Stage 4 is the most severe; ensure documentation confirms exposure of deeper anatomical structures
- •Always attempt to identify the specific site, as stage 4 ulcers require detailed tracking for quality measures and outcomes
Clinical Significance
A stage 4 pressure ulcer of the unspecified site is the most severe stage, with full thickness tissue loss exposing bone, tendon, or muscle. These wounds carry the highest morbidity risk including osteomyelitis, sepsis, and significant mortality, demanding complex interdisciplinary wound care. Stage 4 pressure ulcers have the highest risk adjustment impact in this category, mapping to V28 HCC 379 (RAF 0.662) and V24 HCC 157 (RAF 1.071), reflecting the extreme clinical complexity and cost of care.
Documentation Requirements
- ✓Exact anatomical location with laterality
- ✓Explicit staging as stage 4 by the treating provider
- ✓Documentation of exposed structures (bone, tendon, muscle, joint capsule)
- ✓Wound dimensions: length x width x depth in centimeters
- ✓Presence and measurements of undermining, tunneling, or sinus tracts
- ✓Wound bed description including necrotic tissue, slough, granulation tissue percentages
- ✓Wound drainage characteristics (type, volume, color, odor)
- ✓Signs of infection or osteomyelitis (bone involvement, positive cultures)
- ✓Comprehensive treatment plan including surgical consultation, debridement, negative pressure wound therapy, flap/graft considerations
- ✓Nutritional assessment with albumin/prealbumin levels and dietary interventions
- ✓Pressure redistribution strategy (specialty mattress, turning schedule, offloading devices)
Commonly Confused Codes
L89.93 — Stage 3 of unspecified site has subcutaneous tissue visible but NO exposed bone, tendon, or muscleL89.90 — Unstageable of unspecified site means the wound base is covered by slough or escharM86.x — Osteomyelitis should be coded separately when documented as complication of stage 4 pressure ulcerL97.xxx — Non-pressure chronic ulcers have different etiology (venous, arterial, diabetic); verify pressure as the cause