ICD-10-CM > E00-E89 > E20-E35 > E31 > E31.2 E31.2 Multiple endocrine neoplasia [MEN] syndromes Non-Billable/Non-Specific Applicable To Multiple endocrine adenomatosis Code Also any associated malignancies and other conditions associated with the syndromes Codes E31.20Multiple endocrine neoplasia [MEN] syndrome, unspecifiedE31.21Multiple endocrine neoplasia [MEN] type IE31.22Multiple endocrine neoplasia [MEN] type IIAE31.23Multiple endocrine neoplasia [MEN] type IIB