2026 ICD-10-CM Diagnosis Code R73.03Prediabetes

ICD-10-CM Codes›R00–R99›R70-R79›R73

ICD-10-CM R73.03
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R73.03 is a billable ICD-10-CM diagnosis code for prediabetes. 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. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Prediabetes.

Code Identity

ICD-10-CM Code
R73.03
Billable Status
Yes — Valid for Submission
Code Describes
Prediabetes
Short Description
Prediabetes
Same as the full description in the CMS dataset.
Parent Code
R73.0
Abnormal glucose

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR70-R79Abnormal findings on examination of blood, without diagnosis
CategoryR73Elevated blood glucose level
This CodeR73.03Prediabetes

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Prediabetes
  • Prediabetes in mother during pregnancy

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Latent diabetes

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.

    • Borderline
      • diabetes mellitus
    • Diabetes, diabetic(mellitus) (sugar)
      • latent
    • Prediabetes, prediabetic

Clinical ClassificationClinical

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

CCSR SYM018
Prediabetes
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Prediabetes

Prediabetes means that your blood glucose, or blood sugar, levels are higher than normal but not high enough to be called diabetes. Glucose comes from the foods you eat. Too much glucose in your blood can damage your body over time.

The full article covers:

  • What is prediabetes?
  • What causes prediabetes?
  • Who is at risk for prediabetes?
  • What are the symptoms of prediabetes?
  • How is prediabetes diagnosed?
  • If I have prediabetes, will I get diabetes?
  • Can prediabetes be prevented?

Read the full article at MedlinePlus

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

Convert R73.03 to ICD-9-CMHistory

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

ICD-9-CM
790.29 Abnormal glucose NEC
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement R73.03 replaces the following previously assigned code(s):

  • R73.09 - Other abnormal glucose
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R73.03Overview

Is R73.03 (Abnormal glucose) a billable code?

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

What MS-DRG does R73.03 group to?

When prediabetes 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.

Can R73.03 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the prediabetes is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R73.03?

Under the General Equivalence Mappings, prediabetes converts to ICD-9-CM 790.29 (abnormal glucose 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.