M87.164
BillableOsteonecrosis due to drugs, right fibula
HCC Category Mapping
V24HCC 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 fibula (smaller bone in the lower leg) caused by medication side effects, resulting in bone weakening.
Coding Tips
- •Distinguish between fibula and tibia codes carefully as they represent different lower leg bones
- •Document the causative drug to support medical necessity and treatment decisions
Clinical Significance
Drug-induced osteonecrosis of the right fibula affects the smaller weight-bearing bone of the lower leg, potentially compromising ankle stability and lateral leg support. While less critical than tibial involvement, this condition still requires orthopedic evaluation and may impact overall lower extremity function.
Documentation Requirements
- ✓Specific documentation of right fibula involvement in osteonecrosis
- ✓Causative medication identification with exposure details
- ✓Imaging studies confirming right fibular osteonecrosis
- ✓Assessment of ankle stability and lateral leg function
- ✓Documentation of impact on weight-bearing and mobility
- ✓Drug therapy timeline and correlation with symptom development
- ✓Treatment plan addressing functional limitations
- ✓Provider statement establishing drug-induced etiology
Commonly Confused Codes
M87.161 — Right tibia osteonecrosis affects major weight-bearing boneM87.165 — Left fibula osteonecrosis, opposite lateralityM87.166 — Unspecified fibula when right side is documentedM87.264 — Post-traumatic right fibula requires injury historyS82.4 — Acute fibula fracture is traumatic injury, not chronic necrosis
Code Hierarchy
└M87Osteonecrosis└M87.1Osteonecrosis due to drugs└M87.16Osteonecrosis due to drugs, tibia and fibula└M87.164Osteonecrosis due to drugs, right fibula
└M87.164Osteonecrosis due to drugs, right fibula