Diseases of the musculoskeletal system and connective tissue (M00-M99)
Disorders of muscles (M60-M63)

excludes1
dermatopolymyositis (M33.-)
muscular dystrophies and myopathies (G71-G72)
myopathy in amyloidosis (E85.-)
myopathy in polyarteritis nodosa (M30.0)
myopathy in rheumatoid arthritis (M05.32)
myopathy in scleroderma (M34.-)
myopathy in Sjögren's syndrome (M35.03)
myopathy in systemic lupus erythematosus (M32.-)
M60: Myositis
M61: Calcification and ossification of muscle
M62: Other disorders of muscle
M63: Disorders of muscle in diseases classified elsewhere

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