Other osteomyelitis, multiple sites

This code signifies an inflammatory condition of the bone and bone marrow caused by infection, affecting multiple distinct anatomical locations. It encompasses various forms of osteomyelitis that do not fit more specific categories, presenting simultaneously in more than one bone.

Utilize this code when documentation clearly indicates osteomyelitis affecting several non-contiguous skeletal sites, and the specific type of osteomyelitis is not otherwise classified. Supporting documentation should detail the affected bones and confirm the infectious etiology.

• Ensure documentation specifies "multiple sites" to differentiate from single-site osteomyelitis.
• Do not use this code if a more specific type of osteomyelitis (e.g., acute, chronic, post-traumatic) is documented and can be coded with a more precise M86.x subcategory.
• Always code the underlying infectious organism (e.g., B95-B97) as an additional diagnosis, if known and documented.