Subacute osteomyelitis, unspecified shoulder

This code signifies an inflammatory condition of the bone and bone marrow within the shoulder joint, characterized by a gradual onset and progression over weeks to months. It indicates an infection that has not become chronic but is no longer acute, affecting an unspecified shoulder.

Apply this code when documentation specifies subacute osteomyelitis affecting the shoulder, without laterality specified (e.g., "subacute osteomyelitis of the shoulder"). Supporting documentation should clearly indicate the subacute nature of the infection and its anatomical location.

• Ensure the documentation explicitly states "subacute" and not acute or chronic osteomyelitis.
• Avoid using this code if laterality (right or left shoulder) is specified; instead, use M86.211 or M86.212.
• Always look for an underlying cause or infectious agent (e.g., bacterial, fungal) to code additionally, if documented.