2026 ICD-10-CM Diagnosis Code O24.439Gestational diabetes mellitus in the puerperium, unspecified control

ICD-10-CM Codes›O00-O9A›O20-O29›O24

ICD-10-CM O24.439
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O24.439 is a billable ICD-10-CM diagnosis code for gestational diabetes mellitus in the puerperium, unspecified control. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as gestational diabetes mellitus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complications specified during the puerperium, Diabetes mellitus without complication, and Diabetes or abnormal glucose tolerance complicating pregnancy; childbirth; or the puerperium.

This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such maternal disorders related to pregnancy.

Code Identity

ICD-10-CM Code
O24.439
Billable Status
Yes — Valid for Submission
Code Describes
Gestational diabetes mellitus in the puerperium, unspecified control
Short Description
Gestational diabetes in the puerperium, unsp control
Parent Code
O24.43
Gestational diabetes mellitus in the puerperium

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO20-O29Other maternal disorders predominantly related to pregnancy
CategoryO24Diabetes mellitus in pregnancy, childbirth, and the puerperium
This CodeO24.439Gestational diabetes mellitus in the puerperium, unspecified control

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O24.439.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Gestational diabetes mellitus
  • Postpartum gestational diabetes mellitus

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)
      • gestational (in pregnancy)
        • puerperal
    • Puerperal, puerperium(complicated by, complications)
      • gestational
        • diabetes

Clinical ClassificationClinical

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

CCSR PRG027
Complications specified during the puerperium
Default principal diagnosis: inpatient No · outpatient No
CCSR END002
Diabetes mellitus without complication
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG019
Diabetes or abnormal glucose tolerance complicating pregnancy; childbirth; or the puerperium
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Diabetes and Pregnancy

If you have diabetes, your blood glucose, or blood sugar, levels are too high. Glucose comes from the foods you eat. A hormone called insulin helps the glucose get into your cells to give them energy. With type 1 diabetes, your body does not make insulin. With type 2 diabetes, your body does not make or use insulin well.

The full article covers:

  • What is diabetes?
  • What is gestational diabetes?
  • Who is more likely to develop gestational diabetes?
  • How do I know if I have gestational diabetes?
  • How can diabetes affect my pregnancy?
  • How can I manage diabetes during pregnancy?

Read the full article at MedlinePlus

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

Convert O24.439 to ICD-9-CMHistory

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

ICD-9-CM
648.84 Abn glucose-postpartum
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 O24.439Overview

Is O24.439 (Gestational diabetes mellitus in the puerperium) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report gestational diabetes mellitus in the puerperium, unspecified control on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can O24.439 be reported for?

The Medicare Code Editor checks gestational diabetes mellitus in the puerperium, unspecified control against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of O24.439?

Under the General Equivalence Mappings, gestational diabetes mellitus in the puerperium, unspecified control converts to ICD-9-CM 648.84 (abn glucose-postpartum). 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.