2026 ICD-10-CM Diagnosis Code E51.12Wet beriberi

ICD-10-CM Codes›E00–E89›E50-E64›E51

ICD-10-CM E51.12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E51.12 is a billable ICD-10-CM diagnosis code for wet beriberi. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 640 through 641. Coders also document this condition as beriberi. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nutritional deficiencies.

Code Identity

ICD-10-CM Code
E51.12
Billable Status
Yes — Valid for Submission
Code Describes
Wet beriberi
Short Description
Wet beriberi
Same as the full description in the CMS dataset.
Parent Code
E51.1
Beriberi

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE50-E64Other nutritional deficiencies
CategoryE51Thiamine deficiency
This CodeE51.12Wet beriberi

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Beriberi
  • Cardiac beriberi
  • Shoshin beriberi
  • Wet beriberi

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Beriberi with cardiovascular manifestations
  • Cardiovascular beriberi
  • Shoshin disease

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Beriberi(dry)
      • heart (disease)
    • Beriberi(dry)
      • wet
    • Cardiomyopathy(familial) (idiopathic)
      • beriberi
    • Cardiomyopathy(familial) (idiopathic)
      • due to
        • beriberi
    • Cardiomyopathy(familial) (idiopathic)
      • nutritional
        • beriberi
    • Deficiency, deficient
      • thiamin, thiaminic (chloride)
        • beriberi (dry)
          • wet
    • Deficiency, deficient
      • vitamin (multiple) NOS
        • B (complex) NOS
          • with
            • beriberi (dry)
              • wet
    • Deficiency, deficient
      • vitamin (multiple) NOS
        • B1 NOS
          • beriberi (dry)
            • wet
    • Disease, diseased
      • heart (organic)
        • beriberi (wet)
    • Myocardiopathy(congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic)
      • in (due to)
        • beriberi

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR END007
Nutritional deficiencies
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Beriberi

    a disease caused by a deficiency of thiamine (vitamin b1) and characterized by polyneuritis, cardiac pathology, and edema. the epidemic form is found primarily in areas in which white (polished) rice is the staple food, as in japan, china, the philippines, india, and other countries of southeast asia. (dorland, 27th ed)

  • Wernicke Encephalopathy

    an acute neurological disorder characterized by the triad of ophthalmoplegia, ataxia, and disturbances of mental activity or consciousness. eye movement abnormalities include nystagmus, external rectus palsies, and reduced conjugate gaze. thiamine deficiency and chronic alcoholism are associated conditions. pathologic features include periventricular petechial hemorrhages and neuropil breakdown in the diencephalon and brainstem. chronic thiamine deficiency may lead to korsakoff syndrome. (adams et al., principles of neurology, 6th ed, pp1139-42; davis & robertson, textbook of neuropathology, 2nd ed, pp452-3)

Patient EducationClinical

B Vitamins

The B vitamins are:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert E51.12 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
265.0 Beriberi
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E51.12Overview

Is E51.12 (Beriberi) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report wet beriberi on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does E51.12 group to?

When wet beriberi is the principal diagnosis on an inpatient stay, it groups to MS-DRG 640, 641, with relative weights from 0.7782 to 1.3356 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of E51.12?

Under the General Equivalence Mappings, wet beriberi converts to ICD-9-CM 265.0 (beriberi). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.