E31.21Billable
Multiple endocrine neoplasia [MEN] type I
- Chapter
- 4. Endocrine, nutritional and metabolic diseases
- Category
- E31
- Effective date
- October 1, 2026
Related codes in category E31
E31Polyglandular dysfunctionE31.0Autoimmune polyglandular failureYesE31.1Polyglandular hyperfunctionYesE31.2Multiple endocrine neoplasia [MEN] syndromesE31.20Multiple endocrine neoplasia [MEN] syndrome, unspecifiedYesE31.22Multiple endocrine neoplasia [MEN] type IIAYesE31.23Multiple endocrine neoplasia [MEN] type IIBYesE31.8Other polyglandular dysfunctionYesE31.9Polyglandular dysfunction, unspecifiedYes
Frequently asked questions
What is ICD-10 code E31.21?
E31.21 is an ICD-10-CM diagnosis code for Multiple endocrine neoplasia [MEN] type I.
Is E31.21 a billable code?
Yes. E31.21 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is E31.21 in?
E31.21 falls under Chapter 4: Endocrine, nutritional and metabolic diseases.
When did E31.21 become effective?
E31.21 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to E31.21?
E31.21 belongs to category E31, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.