M87.065
BillableIdiopathic aseptic necrosis of left fibula
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 left fibula (smaller bone in the lower leg) without infection, occurring without a known cause.
Coding Tips
- •Verify laterality is documented as 'left' in the medical record before assigning this code
- •Ensure the necrosis is idiopathic (no trauma, radiation, or other identifiable cause) to distinguish from other M87 subcategories
Clinical Significance
Idiopathic aseptic necrosis of the left fibula represents bone death without infection in the smaller bone of the lower leg, occurring without identifiable cause. This condition can compromise lower leg stability and weight-bearing capacity, potentially requiring surgical intervention and carrying risk for pathological fracture and functional impairment.
Documentation Requirements
- ✓Clear documentation of aseptic necrosis diagnosis
- ✓Specification of left fibula involvement
- ✓Evidence supporting idiopathic (unknown) etiology
- ✓Imaging studies confirming bone necrosis without infection
- ✓Exclusion of traumatic, vascular, or medication-related causes
- ✓Assessment of lower leg stability and function
- ✓Documentation ruling out infectious osteomyelitis
- ✓Treatment plan addressing bone death and functional preservation
Commonly Confused Codes
Code Hierarchy
└M87Osteonecrosis└M87.0Idiopathic aseptic necrosis of bone└M87.06Idiopathic aseptic necrosis of tibia and fibula└M87.065Idiopathic aseptic necrosis of left fibula
└M87.065Idiopathic aseptic necrosis of left fibula