Infective myositis

This code represents inflammation of muscle tissue caused by an infectious agent. It encompasses bacterial, viral, fungal, or parasitic infections directly affecting the skeletal muscles, leading to pain, swelling, and impaired muscle function.

Apply this code when documentation clearly indicates a diagnosis of myositis with an identified or presumed infectious etiology. This includes conditions like pyomyositis, viral myositis, or parasitic myositis, where the infection is the primary cause of the muscle inflammation.

• Always code the underlying infectious organism first, if known and documented, followed by this code.
• Distinguish from non-infectious inflammatory myopathies (e.g., polymyositis, dermatomyositis) which have different code assignments.
• Ensure documentation specifies "infective" or identifies a specific pathogen causing the myositis to support this code.