ICD-10-CM > G00-G99 > G70-G73 > G73 > G73.1 G73.1 Lambert-Eaton syndrome in neoplastic disease Billable/Specific Copy Code Copy Description Code First underlying neoplasm (C00-D49) Type 1 Excludes Lambert-Eaton syndrome not associated with neoplasm (G70.80-G70.81)