2026 ICD-10-CM Diagnosis Code O99.810Abnormal glucose complicating pregnancy

ICD-10-CM Codes›O00-O9A›O94-O9A›O99

ICD-10-CM O99.810
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O99.810 is a billable ICD-10-CM diagnosis code for abnormal glucose complicating pregnancy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as abnormal glucose tolerance in mother complicating pregnancy, childbirth AND/OR puerperium. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diabetes mellitus without complication and Diabetes or abnormal glucose tolerance complicating pregnancy; childbirth; or the puerperium.

Code Identity

ICD-10-CM Code
O99.810
Billable Status
Yes — Valid for Submission
Code Describes
Abnormal glucose complicating pregnancy
Short Description
Abnormal glucose complicating pregnancy
Same as the full description in the CMS dataset.
Parent Code
O99.81
Abnormal glucose complicating pregnancy, childbirth and the puerperium

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO94-O9AOther obstetric conditions, not elsewhere classified
CategoryO99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
This CodeO99.810Abnormal glucose complicating pregnancy

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O99.810.

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.

  • Abnormal glucose tolerance in mother complicating pregnancy, childbirth AND/OR puerperium
  • Glucose tolerance test during pregnancy, childbirth and puerperium outside reference range
  • Glucose tolerance test outside reference range
  • Impaired glucose tolerance in pregnancy
  • Pregnancy with abnormal glucose tolerance test

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.

    • Pregnancy(single) (uterine)
      • complicated by (care of) (management affected by)
        • abnormal, abnormality
          • glucose (tolerance) NEC

Clinical ClassificationClinical

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

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

Childbirth Problems

Childbirth is the process of giving birth to a baby. It includes labor and delivery. Usually everything goes well, but problems can happen. They may cause a risk to the mother, baby, or both. Some of the more common childbirth problems include:

Read the full article at MedlinePlus

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

Convert O99.810 to ICD-9-CMHistory

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

ICD-9-CM
648.81 Abn glucose toler-deliv
Approximate The match is approximate rather than exact.
ICD-9-CM
648.83 Abn glucose-antepartum
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 O99.810Overview

Is O99.810 a billable code?

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

What MS-DRG does O99.810 group to?

When abnormal glucose complicating pregnancy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 817, 818, 819, 831, 832, 833, with relative weights from 0.5229 to 1.6880 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can O99.810 be reported for?

The Medicare Code Editor checks abnormal glucose complicating pregnancy 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 O99.810?

Under the General Equivalence Mappings, abnormal glucose complicating pregnancy converts to ICD-9-CM 648.81 (abn glucose toler-deliv) and 648.83 (abn glucose-antepartum). 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.