M90.561
BillableOsteonecrosis in diseases classified elsewhere, right lower leg
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
Bone death (osteonecrosis) in the right lower leg caused by another disease. The bone tissue in the lower leg dies as a secondary effect of an underlying condition.
Coding Tips
- •Requires a secondary diagnosis code for the underlying disease causing the osteonecrosis
- •Laterality is specified as right; do not use this code for left-sided or bilateral involvement
Clinical Significance
Secondary osteonecrosis of the right lower leg represents bone death in the tibia or fibula caused by an underlying classified disease, requiring comprehensive medical management. This diagnosis significantly impacts risk adjustment modeling due to potential mobility limitations and complex care coordination needs.
Documentation Requirements
- ✓Clear documentation of underlying disease causing secondary osteonecrosis
- ✓Specific identification of right lower leg (tibia/fibula) involvement
- ✓Radiological evidence of bone necrosis (MRI, bone scan, or CT imaging)
- ✓Clinical correlation between primary disease and secondary bone death
- ✓Current management plan for both underlying condition and osteonecrosis
- ✓Assessment of weight-bearing status and mobility limitations
- ✓Provider statement confirming secondary rather than primary cause
- ✓Documentation of treatment response and complication monitoring
Commonly Confused Codes
M87.061 — Primary osteonecrosis of right tibia, not secondary to diseaseM90.569 — Same condition but unspecified lower leg rather than specifically rightM86.161 — Chronic osteomyelitis of right tibia involving infection rather than necrosisS82.91XA — Fracture of right lower leg, which is traumatic rather than disease-relatedM25.561 — Pain in right lower leg, which is symptomatic rather than structural pathology
Code Hierarchy
└M90Osteopathies in diseases classified elsewhere└M90.5Osteonecrosis in diseases classified elsewhere└M90.56Osteonecrosis in diseases classified elsewhere, lower leg└M90.561Osteonecrosis in diseases classified elsewhere, right lower leg
└M90.561Osteonecrosis in diseases classified elsewhere, right lower leg