| E31 | Polyglandular dysfunction | NON-BILLABLE CODE |
| E31.0 | Autoimmune polyglandular failure | BILLABLE CODE |
| E31.1 | Polyglandular hyperfunction | BILLABLE CODE |
| E31.2 | Multiple endocrine neoplasia [MEN] syndromes | NON-BILLABLE CODE |
| E31.20 | Multiple endocrine neoplasia [MEN] syndrome, unspecified | BILLABLE CODE |
| E31.21 | Multiple endocrine neoplasia [MEN] type I | BILLABLE CODE |
| E31.22 | Multiple endocrine neoplasia [MEN] type IIA | BILLABLE CODE |
| E31.23 | Multiple endocrine neoplasia [MEN] type IIB | BILLABLE CODE |
| E31.9 | Polyglandular dysfunction, unspecified | BILLABLE CODE |
