2026 ICD-10-CM Diagnosis Code R73.9Hyperglycemia, unspecified

ICD-10-CM Codes›R00–R99›R70-R79›R73

ICD-10-CM R73.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R73.9 is a billable ICD-10-CM diagnosis code for hyperglycemia, unspecified. 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 Abnormal findings without diagnosis.

Code Identity

ICD-10-CM Code
R73.9
Billable Status
Yes — Valid for Submission
Code Describes
Hyperglycemia, unspecified
Short Description
Hyperglycemia, unspecified
Same as the full description in the CMS dataset.
Parent Code
R73
Elevated blood glucose level

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 CodeR73.9Hyperglycemia, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute hyperglycemia
  • Chorea due to hyperglycemia
  • Chorea due to metabolic disorder
  • Chronic hyperglycemia
  • Dawn phenomenon
  • Drug-induced hyperglycemia
  • High glucose level in blood
  • Hyperglycemia
  • Hyperglycemic disorder
  • Metabolic stress hyperglycemia
  • Neonatal hyperglycemia
  • Non-diabetic hyperglycemia
  • Poor glycemic control
  • Random blood glucose outside reference range
  • Random blood sugar above reference range
  • Random glucose level abnormal
  • Steroid-induced hyperglycemia

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.

    • Elevated, elevation
      • blood sugar
    • Findings, abnormal, inconclusive, without diagnosis
      • blood sugar
        • high
    • Hyperglycemia, hyperglycemic(transient)
    • Sugar
      • blood
        • high (transient)

Clinical ClassificationClinical

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

CCSR SYM017
Abnormal findings without diagnosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Hyperglycemia

    abnormally high blood glucose level.

  • Blood Glucose

    glucose in blood.

  • Neonatal Hyperglycemia

    blood glucose concentration above the upper limit of established reference ranges in a newborn.

Patient EducationClinical

Hyperglycemia

Blood glucose, or blood sugar, is the main sugar found in your blood. It is your body's primary source of energy. It comes from the food you eat. Your body breaks down most of that food into glucose and releases it into your bloodstream. When your blood glucose goes up, it signals your pancreas to release insulin.

The full article covers:

  • What is blood glucose?
  • What is hyperglycemia?
  • What causes hyperglycemia?
  • What are the symptoms of hyperglycemia?
  • What other problems can hyperglycemia cause?
  • How is hyperglycemia diagnosed?
  • What are the treatments for hyperglycemia?
  • Can hyperglycemia be prevented?

Read the full article at MedlinePlus

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

Convert R73.9 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 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 R73.9Overview

Is R73.9 (Elevated blood glucose level) a billable code?

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

What MS-DRG does R73.9 group to?

When hyperglycemia, unspecified 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 R73.9 be a principal diagnosis?

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

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

Under the General Equivalence Mappings, hyperglycemia, unspecified 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.