E51Header code — not billable

Thiamine deficiency

Chapter
4. Endocrine, nutritional and metabolic diseases
Category
E51
Effective date
October 1, 2026

Related codes in category E51

E51.1BeriberiE51.11Dry beriberiYesE51.12Wet beriberiYesE51.2Wernicke's encephalopathyYesE51.8Other manifestations of thiamine deficiencyYesE51.9Thiamine deficiency, unspecifiedYes

Frequently asked questions

What is ICD-10 code E51?

E51 is an ICD-10-CM diagnosis code for Thiamine deficiency.

Is E51 a billable code?

No. E51 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is E51 in?

E51 falls under Chapter 4: Endocrine, nutritional and metabolic diseases.

When did E51 become effective?

E51 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to E51?

E51 belongs to category E51, which includes 6 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.