2026 ICD-10-CM Diagnosis Code E63.0Essential fatty acid [EFA] deficiency

ICD-10-CM Codes›E00–E89›E50-E64›E63

ICD-10-CM E63.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E63.0 is a billable ICD-10-CM diagnosis code for essential fatty acid [EFA] 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 essential fatty acid deficiency. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nutritional deficiencies.

Code Identity

ICD-10-CM Code
E63.0
Billable Status
Yes — Valid for Submission
Code Describes
Essential fatty acid [EFA] deficiency
Short Description
Essential fatty acid [EFA] deficiency
Same as the full description in the CMS dataset.
Parent Code
E63
Other nutritional deficiencies

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE50-E64Other nutritional deficiencies
CategoryE63Other nutritional deficiencies
This CodeE63.0Essential fatty acid [EFA] deficiency

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Essential fatty acid 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
      • essential fatty acid (EFA)

Clinical ClassificationClinical

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

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

Patient EducationClinical

Dietary Fats

Fat is a type of nutrient. You need some fat in your diet but not too much. Fats give you energy and help your body absorb vitamins. Dietary fat also plays a major role in your cholesterol levels.

Read the full article at MedlinePlus

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

Convert E63.0 to ICD-9-CMHistory

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

ICD-9-CM
269.8 Nutrition 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 E63.0Overview

Is E63.0 (Other nutritional deficiencies) a billable code?

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

What MS-DRG does E63.0 group to?

When essential fatty acid [EFA] 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 E63.0?

Under the General Equivalence Mappings, essential fatty acid [EFA] deficiency converts to ICD-9-CM 269.8 (nutrition 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.