ICD-10-CM > G00-G99 > G70-G73 > G73 G73 Disorders of myoneural junction and muscle in diseases classified elsewhere Non-Billable/Non-Specific Codes G73.1Lambert-Eaton syndrome in neoplastic diseaseG73.3Myasthenic syndromes in other diseases classified elsewhereG73.7Myopathy in diseases classified elsewhere