M86.121

HCC Category Mapping

What This Code Means

A sudden bacterial bone infection in the right upper arm bone (humerus) that is not blood-borne in origin, often resulting from trauma, surgery, or local spread of infection.

Coding Tips

• •Verify laterality is documented as right; if not specified, use M86.129
• •Distinguish from hematogenous osteomyelitis which spreads through bloodstream

Clinical Significance

Acute osteomyelitis of the right humerus represents a serious bone infection requiring immediate antibiotic therapy and potential surgical intervention to prevent bone destruction and systemic complications. This condition significantly impacts patient mobility and quality of life, often requiring prolonged treatment courses.

Documentation Requirements

• ✓Specific identification of right humerus involvement
• ✓Documentation of acute onset (symptoms less than 2 weeks)
• ✓Clinical evidence of bone infection (pain, swelling, fever)
• ✓Imaging findings confirming osteomyelitis (MRI, bone scan, or CT)
• ✓Laboratory evidence of infection (elevated WBC, ESR, CRP)
• ✓Causative organism identification when available
• ✓Exclusion of hematogenous osteomyelitis
• ✓Treatment plan including antibiotic therapy duration

Commonly Confused Codes