Polymyositis with myopathy

This code signifies an inflammatory myopathy characterized by progressive, symmetrical muscle weakness and inflammation, specifically when muscle disease (myopathy) is a prominent feature. It involves the skeletal muscles, leading to difficulty with movement and daily activities. The condition is autoimmune in nature, where the body's immune system attacks its own muscle fibers.

Apply this code for patients diagnosed with polymyositis where clinical and/or pathological evidence confirms the presence of myopathy. Documentation should clearly state "polymyositis with myopathy" or describe the characteristic muscle inflammation and weakness consistent with this specific subtype. This code is appropriate when the myopathy is an integral part of the polymyositis presentation.

• Differentiate from other inflammatory myopathies like dermatomyositis (M33.0-) or necrotizing myopathy (M60.81-).
• Ensure documentation specifies "with myopathy" to justify this specific subclassification of polymyositis.
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, followed by any associated manifestations or complications.