M90.522

HCC Category Mapping

What This Code Means

Death of bone tissue in the left upper arm caused by another disease or condition affecting the body.

Coding Tips

• •This is a manifestation code - always code the underlying disease first (the condition causing the osteonecrosis)
• •Verify laterality is documented as left; if not specified, use M90.529 instead

Clinical Significance

Secondary osteonecrosis of the left upper arm indicates bone death in the humerus resulting from underlying systemic disease, creating risk for pathological fracture and significant functional impairment. This diagnosis requires comprehensive management addressing both the primary condition and skeletal complications.

Documentation Requirements

• ✓Underlying disease causing osteonecrosis clearly documented and coded first
• ✓Left upper arm/humerus specifically identified as the affected anatomical site
• ✓Clinical evidence of bone tissue necrosis documented
• ✓Diagnostic imaging confirming presence of osteonecrosis
• ✓Assessment of left arm function and fracture risk
• ✓Treatment plan for both primary disease and bone complications
• ✓Documentation of disease staging or progression

Commonly Confused Codes