M87.871
BillableOther osteonecrosis, right ankle
HCC Category Mapping
V28HCC 92 — Bone/Joint/Muscle Infections/Necrosis
0.209V24HCC 39 — Bone/Joint/Muscle Infections/Necrosis
0.482ESRDHCC 39 — Bone/Joint/Muscle Infections/Necrosis
0.000RxHCCHCC 80 — Bone/Joint/Muscle Infections/Necrosis
0.000What This Code Means
Death of bone tissue in the right ankle joint due to causes other than trauma or radiation.
Coding Tips
- •Ensure right ankle is clearly documented; ankle osteonecrosis may involve talus or other ankle bones
- •Clarify which specific ankle bone is affected if documentation permits more specificity
Clinical Significance
Right ankle osteonecrosis represents avascular bone death in a critical weight-bearing joint, potentially leading to joint collapse and severe functional impairment. This condition requires aggressive management to preserve joint function and prevent the need for ankle replacement.
Documentation Requirements
- ✓Specific documentation of right ankle involvement
- ✓Advanced imaging showing osteonecrosis (MRI preferred for early detection)
- ✓Exclusion of trauma, infection, and radiation as precipitating causes
- ✓Weight-bearing status and ambulatory limitations documented
- ✓Pain level assessment using standardized scales
- ✓Evaluation for underlying predisposing conditions
- ✓Orthopedic consultation and treatment recommendations
- ✓Activity restriction protocols and compliance monitoring
Commonly Confused Codes
M87.371 — Drug-induced osteonecrosis requires specific medication causationM87.171 — Post-traumatic osteonecrosis needs documented trauma historyM87.071 — Idiopathic osteonecrosis has no identifiable underlying causeM19.071 — Primary osteoarthritis is degenerative, not avascular necrosisS93.401A — Ankle sprain is acute injury, not chronic bone death
Code Hierarchy
└M87Osteonecrosis└M87.8Other osteonecrosis└M87.87Other osteonecrosis, ankle, foot and toes└M87.871Other osteonecrosis, right ankle
└M87.871Other osteonecrosis, right ankle