M86.429

HCC Category Mapping

What This Code Means

A long-term bone infection in the upper arm bone (humerus) with a draining sinus tract, but the specific side (right or left) is not identified.

Coding Tips

• •Use this code only when laterality cannot be determined from documentation; query the provider if possible for right or left specification
• •This is a less specific code; prefer M86.421 or M86.422 when laterality is known

Clinical Significance

Chronic osteomyelitis with draining sinus of unspecified humerus indicates a severe bone infection with persistent drainage when laterality is not documented, representing complex disease requiring intensive management. The upper arm involvement significantly impacts functional capacity and treatment planning.

Documentation Requirements

• ✓Documentation of humerus involvement without laterality specification
• ✓Evidence of chronic infection (>6 weeks duration or recurrent)
• ✓Confirmation of active draining sinus tract from humerus
• ✓Imaging findings consistent with chronic osteomyelitis
• ✓Clinical evidence of persistent drainage from arm bone
• ✓Laboratory evidence supporting chronic infectious process
• ✓Treatment history addressing both infection and drainage
• ✓Absence of clear laterality documentation in record

Commonly Confused Codes