| G70 | Myasthenia gravis and other myoneural disorders |
| G70.0 | Myasthenia gravis |
| G70.00 | Myasthenia gravis without (acute) exacerbation |
| G70.01 | Myasthenia gravis with (acute) exacerbation |
| G70.1 | Toxic myoneural disorders |
| G70.2 | Congenital and developmental myasthenia |
| G70.8 | Other specified myoneural disorders |
| G70.80 | Lambert-Eaton syndrome, unspecified |
| G70.81 | Lambert-Eaton syndrome in disease classified elsewhere |
| G70.89 | Other specified myoneural disorders |
| G70.9 | Myoneural disorder, unspecified |
| G71 | Primary disorders of muscles |
| G71.0 | Muscular dystrophy |
| G71.1 | Myotonic disorders |
| G71.11 | Myotonic muscular dystrophy |
| G71.12 | Myotonia congenita |
| G71.13 | Myotonic chondrodystrophy |
| G71.14 | Drug induced myotonia |
| G71.19 | Other specified myotonic disorders |
| G71.2 | Congenital myopathies |
| G71.3 | Mitochondrial myopathy, not elsewhere classified |
| G71.8 | Other primary disorders of muscles |
| G71.9 | Primary disorder of muscle, unspecified |
| G72 | Other and unspecified myopathies |
| G72.0 | Drug-induced myopathy |
| G72.1 | Alcoholic myopathy |
| G72.2 | Myopathy due to other toxic agents |
| G72.3 | Periodic paralysis |
| G72.4 | Inflammatory and immune myopathies, not elsewhere classified |
| G72.41 | Inclusion body myositis [IBM] |
| G72.49 | Other inflammatory and immune myopathies, not elsewhere classified |
| G72.8 | Other specified myopathies |
| G72.81 | Critical illness myopathy |
| G72.89 | Other specified myopathies |
| G72.9 | Myopathy, unspecified |
| G73 | Disorders of myoneural junction and muscle in diseases classified elsewhere |
| G73.1 | Lambert-Eaton syndrome in neoplastic disease |
| G73.3 | Myasthenic syndromes in other diseases classified elsewhere |
| G73.7 | Myopathy in diseases classified elsewhere |