E31.23
Multiple endocrine neoplasia [MEN] type IIB
E31.23 (also written E3123) is a billable ICD-10-CM diagnosis code for multiple endocrine neoplasia [MEN] type IIB. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 8 codes in category E31 (Polyglandular dysfunction). The Alphabetic Index lists it under 1 entry. Its coding notes include a Code also instruction and 6 Excludes1 entries.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
- any associated malignancies and other conditions associated with the syndromes
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Other clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Notes
Also from chapter/block level (1 note)
- All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry