M90.551
BillableOsteonecrosis in diseases classified elsewhere, right thigh
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 thigh bone caused by another disease or condition affecting the body.
Coding Tips
- •The thigh includes the femur; this is a common site for osteonecrosis, especially from sickle cell disease or corticosteroid use
- •Ensure the underlying etiology is documented and coded as the primary diagnosis
Clinical Significance
Secondary osteonecrosis of the right thigh represents significant bone death in the femur caused by an underlying systemic disease, requiring complex medical management. This diagnosis has major risk adjustment implications due to potential mobility limitations and the critical nature of femoral bone integrity.
Documentation Requirements
- ✓Documentation of underlying classified disease causing the osteonecrosis
- ✓Specific identification of right thigh/femur as affected anatomical site
- ✓Imaging evidence of bone necrosis (MRI, bone scan, or CT studies)
- ✓Clinical correlation between primary disease and secondary bone death
- ✓Current treatment plan addressing both conditions simultaneously
- ✓Assessment of mobility and weight-bearing capacity
- ✓Provider documentation confirming secondary rather than primary cause
- ✓Monitoring for complications such as pathological fracture risk
Commonly Confused Codes
M87.051 — Primary osteonecrosis of right femur, not caused by another diseaseM90.559 — Same condition but unspecified thigh rather than specifically rightM86.151 — Chronic osteomyelitis of right femur involving infection rather than necrosisS72.91XA — Fracture of right femur, which is traumatic rather than disease-relatedM79.3 — Panniculitis of thigh, which affects soft tissue rather than bone
Code Hierarchy
└M90Osteopathies in diseases classified elsewhere└M90.5Osteonecrosis in diseases classified elsewhere└M90.55Osteonecrosis in diseases classified elsewhere, thigh└M90.551Osteonecrosis in diseases classified elsewhere, right thigh
└M90.551Osteonecrosis in diseases classified elsewhere, right thigh