M87.064

HCC Category Mapping

What This Code Means

Death of bone tissue in the right fibula (smaller bone in the lower leg) without infection, occurring without a known cause. This condition can cause pain and may affect lower leg stability and function.

Coding Tips

• •Confirm right side is documented in the medical record
• •Distinguish from tibial necrosis (M87.061-063) which affects the larger bone in the lower leg

Clinical Significance

Idiopathic aseptic necrosis of the right fibula represents bone death in the smaller lower leg bone without identifiable cause, potentially causing pain and affecting lower leg stability and function. This condition can cause pain and may affect lower leg stability and function, though typically less severe than tibial involvement.

Documentation Requirements

• ✓Documentation of aseptic necrosis specifically affecting right fibula
• ✓Confirmation of idiopathic etiology with no underlying cause identified
• ✓Imaging evidence demonstrating bone necrosis in right fibular structures
• ✓Clear laterality documentation specifying right fibula involvement
• ✓Exclusion of infectious processes through clinical evaluation
• ✓Assessment of lower leg stability and ankle function
• ✓Treatment plan including conservative management or surgical options
• ✓Documentation of pain and any functional limitations

Commonly Confused Codes