Infective myositis, unspecified arm

This code signifies an inflammatory condition of the muscle tissue in the left arm caused by an infection. It indicates that the specific infectious agent responsible for the myositis has not been identified or documented. The condition typically presents with pain, swelling, and tenderness in the affected arm.

Use this code when documentation clearly states "infective myositis" affecting the left arm, and the causative organism is not specified. This applies to cases where the infection source is unknown, or laboratory results for pathogen identification are pending or inconclusive. Supporting documentation would include physician notes detailing the diagnosis of infective myositis of the left arm without further specificity.

• Ensure the documentation explicitly states "unspecified" or "NOS" regarding the infectious agent for the left arm.
• Avoid using this code if the specific infectious organism (e.g., bacterial, viral, fungal) is identified; instead, use a more specific code from the M60.0- subcategory.
• Always query the provider if the laterality (left vs. right) is not clearly documented, as M60.001 is for the right arm and M60.009 is for unspecified arm.