ICD-10-CM > G00-G99 > G70-G73 > G73 > G73.7 G73.7 Myopathy in diseases classified elsewhere Billable/Specific Copy Code Copy Description Code First underlying disease, such as:glycogen storage disease (E74.0-)hyperparathyroidism (E21.0, E21.3)hypoparathyroidism (E20.-)lipid storage disorders (E75.-) Type 1 Excludes myopathy in:rheumatoid arthritis (M05.32)sarcoidosis (D86.87)scleroderma (M34.82)Sjögren syndrome (M35.03)systemic lupus erythematosus (M32.19)