G73: Disorders of myoneural junction and muscle in diseases classified elsewhere
G73.7: Myopathy in diseases classified elsewhere

codeFirst
underlying disease, such as:
hyperparathyroidism (E21.0, E21.3)
hypoparathyroidism (E20.-)
glycogen storage disease (E74.0)
lipid storage disorders (E75.-)

excludes1
myopathy in:
rheumatoid arthritis (M05.32)
sarcoidosis (D86.87)
scleroderma (M34.82)
Sjögren syndrome (M35.03)
systemic lupus erythematosus (M32.19)

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