Disorders of myoneural junction and muscle in diseases classified elsewhere (G73)

The ICD-10 code section G73 covers disorders affecting the myoneural junction and muscles that occur as part of other diseases. These codes are specifically used when muscle or nerve-muscle connection problems arise secondary to underlying conditions rather than as primary diseases.

This section includes codes like G73.1 for Lambert-Eaton syndrome in neoplastic disease, which is also called Eaton-Lambert syndrome with underlying malignancy, targeting cases where this rare immune disorder occurs alongside cancer. The code G73.3 describes myasthenic syndromes associated with other diseases, such as those caused by hypothyroidism or pernicious anemia, helping to identify muscle weakness due to these secondary causes. Meanwhile, G73.7 encompasses a broad range of myopathies in diseases classified elsewhere, including various metabolic, autoimmune, endocrine, and paraneoplastic muscle disorders. This code is vital for capturing muscle conditions linked to systemic illnesses like Cushing’s syndrome, amyloidosis, or lipid storage diseases. Utilizing these codes ensures precise classification when myoneural or muscle dysfunction is a manifestation of another identified disease.