Other osteomyelitis, upper arm

This code signifies an infection of the bone in the upper arm (humerus) that does not fit into more specific categories of osteomyelitis. This includes various forms of osteomyelitis such as chronic, subacute, or acute forms not otherwise specified, or those due to unusual pathogens.

Use this code when documentation clearly indicates osteomyelitis affecting the humerus, and the specific type (e.g., acute hematogenous, chronic with draining sinus) is not precisely identified or falls under "other specified." This code is appropriate when the physician's diagnosis explicitly states "other osteomyelitis of the upper arm" or provides details that preclude more specific osteomyelitis codes for this anatomical site.

• Ensure the documentation specifies the upper arm (humerus) as the affected site.
• Always look for more specific osteomyelitis codes (e.g., M86.12, M86.22) before defaulting to this "other" category.
• Confirm the infectious agent, if known, is coded separately as an additional diagnosis.