M86.122

HCC Category Mapping

What This Code Means

A bone infection (osteomyelitis) that develops suddenly in the left upper arm bone (humerus), typically caused by bacteria entering the bone through injury or bloodstream.

Coding Tips

• •Verify laterality is documented as 'left' in the medical record before assigning this code
• •Ensure the infection is acute (not chronic) and confirm the causative organism if documented for potential additional coding

Clinical Significance

Acute osteomyelitis of the left 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 left 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