M90.569
BillableOsteonecrosis in diseases classified elsewhere, unspecified 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 lower leg caused by another disease, side not specified. The bone tissue in the lower leg dies as a secondary effect of an underlying condition.
Coding Tips
- •Use only when the specific side of the lower leg is not documented or is bilateral
- •Always pair with a secondary diagnosis code for the underlying disease causing the osteonecrosis
Clinical Significance
Secondary osteonecrosis of unspecified lower leg represents bone death in tibia or fibula caused by an underlying classified disease, requiring complex medical management. This diagnosis significantly impacts risk adjustment modeling due to mobility limitations and the critical role of lower leg bones in weight-bearing function.
Documentation Requirements
- ✓Clear documentation of underlying disease causing secondary osteonecrosis
- ✓Clinical evidence of lower leg bone involvement without laterality specification
- ✓Radiological confirmation of osteonecrotic changes (MRI, bone scan, CT)
- ✓Provider statement establishing causal relationship to classified disease
- ✓Treatment plan addressing both primary condition and bone necrosis
- ✓Assessment of weight-bearing capacity and mobility status
- ✓Documentation excluding primary or traumatic causes
- ✓Monitoring plan for potential complications and treatment response
Commonly Confused Codes
M87.069 — Primary osteonecrosis of unspecified tibia, not disease-relatedM90.561 — Same condition but specifically right lower leg rather than unspecifiedM90.562 — Same condition but specifically left lower leg rather than unspecifiedM86.169 — Chronic osteomyelitis of unspecified tibia involving infectionM25.569 — Pain in unspecified lower leg, which is symptomatic rather than structural
Code Hierarchy
└M90Osteopathies in diseases classified elsewhere└M90.5Osteonecrosis in diseases classified elsewhere└M90.56Osteonecrosis in diseases classified elsewhere, lower leg└M90.569Osteonecrosis in diseases classified elsewhere, unspecified lower leg
└M90.569Osteonecrosis in diseases classified elsewhere, unspecified lower leg