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ICD-10-CM 2027 diagnosis code

E45Retarded development following protein-calorie malnutrition

✓ Billable / specificCC — complication/comorbidity

E45 is a valid, billable ICD-10-CM code for retarded development following protein-calorie malnutrition. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Stunting, ICD-10 code for Nutritional stunting.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About E45

E45 is the ICD-10-CM diagnosis code for Retarded development following protein-calorie malnutrition. It belongs to block E40-E46 (malnutrition) and chapter 4 (endocrine, nutritional and metabolic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 640 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC, relative weight 1.3395) and DRG 641 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC, relative weight 0.7865), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 263.2 (Arrested development following protein-calorie malnutrition).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Nutritional short stature
  • Nutritional stunting
  • Physical retardation due to malnutrition

Notes that apply from higher levels

Instructions written at a parent level also apply to E45.

Broader instructions also apply from E40-E46 Malnutrition and Chapter 4: Endocrine, nutritional and metabolic diseases.

Alphabetic index entries

8 entries

Terms in the official ICD-10-CM index that lead to E45.

Codes whose notes reference E45

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 263.2Arrested development following protein-calorie malnutritionapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about E45

Is E45 billable?

Yes. E45 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can E45 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict E45 as a principal diagnosis.

Is E45 a CC or MCC?

E45 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does E45 group to?

E45 is used in the MS-DRG v44.0 logic for MS-DRG 640 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC) and MS-DRG 641 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for E45?

The CMS General Equivalence Mappings map E45 to ICD-9-CM 263.2.