2026 ICD-10-CM Diagnosis Code E61.2Magnesium deficiency

ICD-10-CM Codes›E00–E89›E50-E64›E61

ICD-10-CM E61.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E61.2 is a billable ICD-10-CM diagnosis code for magnesium deficiency. 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 inadequate magnesium intake. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nutritional deficiencies.

Code Identity

ICD-10-CM Code
E61.2
Billable Status
Yes — Valid for Submission
Code Describes
Magnesium deficiency
Short Description
Magnesium deficiency
Same as the full description in the CMS dataset.
Parent Code
E61
Deficiency of other nutrient elements

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE50-E64Other nutritional deficiencies
CategoryE61Deficiency of other nutrient elements
This CodeE61.2Magnesium deficiency

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Inadequate magnesium intake
  • Magnesium deficiency
  • Myopathy due to magnesium deficiency

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.

    • Deficiency, deficient
      • magnesium

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

  • Magnesium Deficiency

    a nutritional condition produced by a deficiency of magnesium in the diet, characterized by anorexia, nausea, vomiting, lethargy, and weakness. symptoms are paresthesias, muscle cramps, irritability, decreased attention span, and mental confusion, possibly requiring months to appear. deficiency of body magnesium can exist even when serum values are normal. in addition, magnesium deficiency may be organ-selective, since certain tissues become deficient before others. (harrison's principles of internal medicine, 12th ed, p1936)

Patient EducationClinical

Malnutrition

Malnutrition means that your body isn't getting enough calories or the right balance of nutrients to stay healthy. This can happen if you don't get enough protein, carbohydrates, and fats, eat too much unhealthy food, or don't get the vitamins and minerals your body needs.

The full article covers:

  • What is malnutrition?
  • What are the types of malnutrition?
  • What causes malnutrition?
  • Who is at risk for developing malnutrition?
  • What are the symptoms of malnutrition?
  • How is malnutrition diagnosed?
  • What are the treatments for malnutrition?
  • Can malnutrition be prevented?

Read the full article at MedlinePlus

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

Convert E61.2 to ICD-9-CMHistory

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

ICD-9-CM
269.3 Mineral deficiency NEC
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 E61.2Overview

Is E61.2 (Deficiency of other nutrient elements) a billable code?

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

What MS-DRG does E61.2 group to?

When magnesium deficiency 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 E61.2?

Under the General Equivalence Mappings, magnesium deficiency converts to ICD-9-CM 269.3 (mineral deficiency NEC). 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.