Acute hematogenous osteomyelitis, unspecified humerus

This code signifies an acute bone infection of the humerus, originating from a bloodstream infection. It indicates a rapid onset and progression of inflammation and destruction within the bone tissue, without further specification of the exact humerus involved (left or right).

Use this code for patients presenting with sudden onset of pain, swelling, and fever localized to the upper arm, where diagnostic imaging (e.g., X-ray, MRI) and laboratory findings (e.g., elevated inflammatory markers, positive blood cultures) confirm acute osteomyelitis. Documentation should clearly state "acute hematogenous osteomyelitis" affecting an unspecified humerus.

• Ensure documentation specifies "acute" and "hematogenous" to differentiate from chronic or other forms of osteomyelitis.
• If the laterality (left or right humerus) is documented, a more specific code (M86.021 or M86.022) should be used.
• Always sequence this code first if it is the primary reason for the encounter, followed by codes for any associated systemic infections or complications.