Other acute osteomyelitis, left humerus

This code signifies an acute inflammatory process of the bone and bone marrow, specifically affecting the left humerus, that is not due to a bacterial infection (e.g., staphylococcal, streptococcal). It indicates a rapid onset and progression of bone infection in the upper arm.

Apply this code when documentation clearly states "acute osteomyelitis" of the left humerus, and the etiology is specified as something other than a common bacterial pathogen (e.g., fungal, viral, or unspecified non-bacterial). Supporting documentation would include imaging reports confirming osteomyelitis and microbiology results ruling out typical bacterial causes or identifying an atypical pathogen.

• Ensure laterality (left) and bone (humerus) are explicitly documented.
• Distinguish between acute and chronic osteomyelitis; this code is for acute forms.
• Do not use if the documentation specifies a bacterial cause, such as Staphylococcus aureus, as more specific codes exist for those etiologies.