M87.365

HCC Category Mapping

What This Code Means

Death of bone tissue in the left fibula (smaller bone in the lower leg) caused by an underlying condition or treatment, such as radiation therapy or corticosteroid use.

Coding Tips

• •Verify the laterality is documented as left; if documentation is unclear, query the provider before coding
• •Ensure the underlying cause of secondary osteonecrosis is documented separately to support medical necessity

Clinical Significance

This diagnosis represents secondary osteonecrosis of the left fibula caused by underlying conditions such as corticosteroid use or radiation therapy, which may cause lateral leg pain and potentially affect ankle stability. It requires management of the underlying cause and monitoring for progression.

Documentation Requirements

• ✓Documentation of osteonecrosis affecting left fibula
• ✓Identification of underlying cause (e.g., corticosteroid use, radiation therapy, sickle cell disease)
• ✓Imaging findings confirming fibular bone necrosis (MRI, X-ray, CT)
• ✓Clinical symptoms such as lateral leg pain or ankle instability
• ✓Specific location within fibula (proximal, mid-shaft, distal)
• ✓Functional impact on walking or weight-bearing
• ✓Duration and progression of condition
• ✓Treatment history and response to interventions

Commonly Confused Codes