Infective myositis, right upper arm

This code identifies inflammation of the muscles in the patient's right upper arm caused by an infection. This condition typically presents with localized pain, swelling, and tenderness, often accompanied by systemic signs of infection such as fever. The infection can be bacterial, viral, fungal, or parasitic.

Apply this code when documentation explicitly states infective myositis affecting the right upper arm. This diagnosis is supported by clinical findings, imaging studies (e.g., MRI showing muscle inflammation), and laboratory results confirming an infectious etiology. Ensure the laterality (right) and anatomical site (upper arm) are clearly documented.

• Differentiate from non-infective myositis (e.g., autoimmune) which would require a different code.
• Always look for documentation of the specific infectious agent if known, as an additional code may be required.
• Verify the exact anatomical location; "upper arm" refers to the region between the shoulder and the elbow.