Infective myositis, left upper arm

This code signifies an inflammation of the muscle tissue in the patient's left upper arm caused by an infection. This condition typically presents with localized pain, swelling, and tenderness, often accompanied by systemic signs of infection like fever.

Apply this code when documentation clearly indicates an infectious etiology for myositis affecting the left upper arm. This includes bacterial, viral, fungal, or parasitic infections confirmed by culture, serology, or clinical presentation. Ensure the medical record specifies the laterality and anatomical site.

• Always confirm the infectious agent if specified in the documentation, as additional codes for the specific infection may be required.
• Differentiate from non-infectious myositis (e.g., autoimmune) which would be coded differently.
• Verify laterality; ensure the documentation explicitly states "left upper arm" to support this specific code.