Juvenile dermatomyositis with myopathy

This code signifies a pediatric autoimmune inflammatory myopathy characterized by both muscle weakness (myopathy) and distinctive skin rashes. It involves chronic inflammation of the muscles and skin, often presenting with proximal muscle weakness and classic heliotrope rash or Gottron papules.

Assign this code for patients under 18 years of age diagnosed with dermatomyositis where muscle involvement is a prominent feature. Documentation should clearly state "juvenile dermatomyositis" and indicate the presence of myopathy, often supported by elevated muscle enzymes, electromyography (EMG) findings, or muscle biopsy.

• Differentiate from adult-onset dermatomyositis (M33.00, M33.01, M33.09) based on patient age.
• Ensure documentation specifies "with myopathy" to accurately select this subcategory over other dermatomyositis codes.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, followed by any associated manifestations.