2026 ICD-10-CM Diagnosis Code E13.00Other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)

ICD-10-CM Codes›E00–E89›E08-E13›E13

ICD-10-CM E13.00
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E13.00 is a billable ICD-10-CM diagnosis code for other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 637 through 639. Coders also document this condition as hyperosmolarity due to secondary diabetes mellitus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diabetes mellitus with complication; and Diabetes mellitus, due to underlying condition, drug or chemical induced, or other specified type.

Code Identity

ICD-10-CM Code
E13.00
Billable Status
Yes — Valid for Submission
Code Describes
Other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
Short Description
Oth diab w hyprosm w/o nonket hyprgly-hypros coma (NKHHC)
Parent Code
E13.0
Other specified diabetes mellitus with hyperosmolarity

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE08-E13Diabetes mellitus
CategoryE13Other specified diabetes mellitus
This CodeE13.00Other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)

Quality Payment Program MeasuresBilling

Medicare quality measures that can apply when E13.00 is part of the patient record.

Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)

High Priority: YES

Measure Type: Intermediateoutcome

Submission Methods: Claims, Electronic Health Record, Cms Web Interface, Registry

Description: Percentage of patients 18-75 years of age with diabetes who had hemoglobin A1c > 9.0% during the measurement period.

View Measure

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hyperosmolarity due to secondary diabetes mellitus

Coding GuidelinesGuidance

The diabetes mellitus codes are combination codes that include the type of diabetes mellitus, the body system affected, and the complications affecting that body system. As many codes within a particular category as are necessary to describe all of the complications of the disease may be used. They should be sequenced based on the reason for a particular encounter. Assign as many codes from categories E08 - E13 as needed to identify all of the associated conditions that the patient has.

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

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.

    • Diabetes, diabetic(mellitus) (sugar)
      • specified type NEC
        • with
          • hyperosmolarity

Clinical ClassificationClinical

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

CCSR END003
Diabetes mellitus with complication
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR END006
Diabetes mellitus, due to underlying condition, drug or chemical induced, or other specified type
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Diabetes

Diabetes, also known as diabetes mellitus, is a disease in which your blood glucose, or blood sugar, levels are too high. Glucose is your body's main source of energy. Your body can make glucose, but it also comes from the food you eat. Insulin is a hormone made by your pancreas.

The full article covers:

  • What is diabetes?
  • What are the types of diabetes?
  • What causes diabetes?
  • Who is more likely to develop diabetes?
  • What are the symptoms of diabetes?
  • How is diabetes diagnosed?
  • What are the treatments for diabetes?
  • Can diabetes be prevented?

Read the full article at MedlinePlus

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

Convert E13.00 to ICD-9-CMHistory

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

ICD-9-CM
249.20 Sec DM hpros nt st uncnr
Approximate The match is approximate rather than exact.
ICD-9-CM
250.20 DMII hprsm nt st uncntrl
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 E13.00Overview

Is E13.00 (Other specified diabetes mellitus with hyperosmolarity) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does E13.00 group to?

When other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 637, 638, 639, with relative weights from 0.6212 to 1.4367 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of E13.00?

Under the General Equivalence Mappings, other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC) converts to ICD-9-CM 249.20 (sec DM hpros nt st uncnr) and 250.20 (DMII hprsm nt st uncntrl). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.