ICD-10-CM Code For Unspecified Severe Protein-Calorie Malnutrition: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group E43 includes unspecified severe protein-calorie malnutrition, describing cases of significant nutritional deficiency where severity is documented but an exact etiology is not specified. These ICD-10-CM diagnosis codes are used to document severe malnutrition affecting overall nutritional status, capturing clinical severity and the need for intervention. Accurate coding within the ICD-10-CM E43 group supports complete clinical documentation, proper claim adjudication, and appropriate reimbursement.

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ICD-10-CM E43: Unspecified Severe Protein-Calorie Malnutrition Overview

This code group represents severe protein-calorie malnutrition that is unspecified in clinical documentation, affecting nutritional status and whole-body metabolism. It targets conditions related to extreme nutritional deficiency rather than a specific organ system. Accurate coding matters for appropriate clinical documentation and can affect reimbursement and resource allocation for nutritional support services.

When to Use

Use a code from this group when a patient has documented severe protein-calorie malnutrition without a more specific malnutrition diagnosis. These codes are appropriate when clinical records indicate severity but lack sufficient detail to assign a more specific malnutrition code.

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
E43	Unspecified severe protein-calorie malnutrition

DRG Codes

4 rows

DRG Code	Description
640	Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC
641	Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC
791	Prematurity with Major Problems
793	Full Term Neonate with Major Problems

Typical Clinical Scenarios

An elderly nursing home resident with progressive unintentional weight loss, marked muscle wasting, and generalized weakness over months who requires assistance with all activities of daily living. The resident is evaluated during a primary care visit after recurrent falls and inability to maintain oral intake; laboratory studies show hypoalbuminemia and the clinician cannot identify features that localize to mild or moderate malnutrition categories, so an unspecified severe protein-calorie malnutrition code is assigned. Typical codes: E43
An adult with advanced metastatic cancer receiving palliative care presents to the emergency department with profound cachexia, minimal oral intake for several weeks, and marked loss of subcutaneous fat and muscle mass leading to inability to sit up without assistance. The acute care team documents severe global deficiency of protein and calories without a more specific localized malnutrition diagnosis, prompting assignment of an unspecified severe protein-calorie malnutrition code as a comorbidity contributing to functional decline. Typical codes: E43
A hospitalized patient with chronic alcohol use disorder and repeated hospitalizations for infections is found on admission assessment to have severe weight loss, muscle wasting, and signs of malnutrition that predate the current infection; nutritional assessment cannot distinguish a specific etiology beyond severe protein-calorie deficiency. Because the malnutrition is severe and unspecified as to a more specific type, the inpatient record carries an unspecified severe protein-calorie malnutrition diagnosis to capture the impact on care and recovery. Typical codes: E43

Related Codes

E40-KWASHIORKOR

ICD-10-CM Code For Kwashiorkor: Group Overview

E41-NUTRITIONAL-MARASMUS

ICD-10-CM Code For Nutritional Marasmus: Group Overview

E42-MARASMIC-KWASHIORKOR

ICD-10-CM Code For Marasmic Kwashiorkor: Group Overview

E44-PROTEIN-CALORIE-MALNUTRITION

ICD-10-CM Code For Protein-Calorie Malnutrition Of Moderate And Mild Degree: Group Overview

E45-RETARDED-DEVELOPMENT-FOLLOWING-PROTEIN-CALORIE-MALNUTRITION

ICD-10-CM Code For Retarded Development Following Protein Calorie Malnutrition: Group Overview

E46-UNSPECIFIED-PROTEIN-CALORIE-MALNUTRITION

ICD-10-CM Code For Unspecified Protein-Calorie Malnutrition: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
E43	Unspecified severe protein-calorie malnutrition

DRG Codes

4 rows

DRG Code	Description
640	Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC
641	Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC
791	Prematurity with Major Problems
793	Full Term Neonate with Major Problems

Typical Clinical Scenarios

An elderly nursing home resident with progressive unintentional weight loss, marked muscle wasting, and generalized weakness over months who requires assistance with all activities of daily living. The resident is evaluated during a primary care visit after recurrent falls and inability to maintain oral intake; laboratory studies show hypoalbuminemia and the clinician cannot identify features that localize to mild or moderate malnutrition categories, so an unspecified severe protein-calorie malnutrition code is assigned. Typical codes: E43
An adult with advanced metastatic cancer receiving palliative care presents to the emergency department with profound cachexia, minimal oral intake for several weeks, and marked loss of subcutaneous fat and muscle mass leading to inability to sit up without assistance. The acute care team documents severe global deficiency of protein and calories without a more specific localized malnutrition diagnosis, prompting assignment of an unspecified severe protein-calorie malnutrition code as a comorbidity contributing to functional decline. Typical codes: E43
A hospitalized patient with chronic alcohol use disorder and repeated hospitalizations for infections is found on admission assessment to have severe weight loss, muscle wasting, and signs of malnutrition that predate the current infection; nutritional assessment cannot distinguish a specific etiology beyond severe protein-calorie deficiency. Because the malnutrition is severe and unspecified as to a more specific type, the inpatient record carries an unspecified severe protein-calorie malnutrition diagnosis to capture the impact on care and recovery. Typical codes: E43

Related Codes

E40-KWASHIORKOR

ICD-10-CM Code For Kwashiorkor: Group Overview

E41-NUTRITIONAL-MARASMUS

ICD-10-CM Code For Nutritional Marasmus: Group Overview

E42-MARASMIC-KWASHIORKOR

ICD-10-CM Code For Marasmic Kwashiorkor: Group Overview

E44-PROTEIN-CALORIE-MALNUTRITION

ICD-10-CM Code For Protein-Calorie Malnutrition Of Moderate And Mild Degree: Group Overview

E45-RETARDED-DEVELOPMENT-FOLLOWING-PROTEIN-CALORIE-MALNUTRITION

ICD-10-CM Code For Retarded Development Following Protein Calorie Malnutrition: Group Overview

E46-UNSPECIFIED-PROTEIN-CALORIE-MALNUTRITION

ICD-10-CM Code For Unspecified Protein-Calorie Malnutrition: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Unspecified Severe Protein-Calorie Malnutrition: Group Overview

Sign up for ICD-10-CM Code For Unspecified Severe Protein-Calorie Malnutrition: Group Overview policy alerts

ICD-10-CM E43: Unspecified Severe Protein-Calorie Malnutrition Overview

ICD-10-CM Code For Unspecified Severe Protein-Calorie Malnutrition: Group Overview

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ICD-10-CM E43: Unspecified Severe Protein-Calorie Malnutrition Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

When should I use `E43` for documentation?

How does `E43` affect claim adjudication and reimbursement?

What clinical scope does the `E43` group represent?

Are there related DRGs tied to `E43` that coders should note?

What is the importance of accuracy when coding `E43`?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

When should I use `E43` for documentation?

How does `E43` affect claim adjudication and reimbursement?

What clinical scope does the `E43` group represent?

Are there related DRGs tied to `E43` that coders should note?

What is the importance of accuracy when coding `E43`?

References