2026 ICD-10-CM Diagnosis Code O00.91Unspecified ectopic pregnancy with intrauterine pregnancy

ICD-10-CM Codes›O00-O9A›O00-O08›O00

ICD-10-CM O00.91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O00.91 is a billable ICD-10-CM diagnosis code for unspecified ectopic pregnancy with intrauterine 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 combined pregnancy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Ectopic pregnancy and complications of ectopic pregnancy.

Code Identity

ICD-10-CM Code
O00.91
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified ectopic pregnancy with intrauterine pregnancy
Short Description
Unspecified ectopic pregnancy with intrauterine pregnancy
Same as the full description in the CMS dataset.
Parent Code
O00.9
Ectopic pregnancy, unspecified

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO00-O08Pregnancy with abortive outcome
CategoryO00Ectopic pregnancy
This CodeO00.91Unspecified ectopic pregnancy with intrauterine pregnancy

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O00.91.

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.

  • Combined pregnancy
  • Finding of position of pregnancy
  • Intrauterine pregnancy

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.

    • Hematocele
      • female NEC
        • with ectopic pregnancy
          • with intrauterine pregnancy
    • Pregnancy(single) (uterine)
      • ectopic (ruptured)
        • with intrauterine pregnancy

Clinical ClassificationClinical

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

CCSR PRG005
Ectopic pregnancy and complications of ectopic pregnancy
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Ectopic Pregnancy

The uterus, or womb, is the place where a fetus grows during pregnancy. In an ectopic pregnancy, the fertilized egg grows in the wrong place outside the uterus. It usually occurs in the fallopian tubes. These tubes carry eggs from the ovaries to the uterus.

The full article covers:

  • What is an ectopic pregnancy?
  • What increases my risk of an ectopic pregnancy?
  • What are the symptoms of an ectopic pregnancy?
  • How is an ectopic pregnancy diagnosed?
  • What is the treatment for an ectopic pregnancy?

Read the full article at MedlinePlus

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

Convert O00.91 to ICD-9-CMHistory

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

ICD-9-CM
633.91 Ectp preg NOS w int preg
Exact Match The mapping is direct, with no qualifiers.

Code History & ChangesHistory

Replacement O00.91 replaces the following previously assigned code(s):

  • O00.9 - Ectopic pregnancy, unspecified
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 O00.91Overview

Is O00.91 (Ectopic pregnancy, unspecified) a billable code?

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

What MS-DRG does O00.91 group to?

When unspecified ectopic pregnancy with intrauterine 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 O00.91 be reported for?

The Medicare Code Editor checks unspecified ectopic pregnancy with intrauterine 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 O00.91?

Under the General Equivalence Mappings, unspecified ectopic pregnancy with intrauterine pregnancy converts to ICD-9-CM 633.91 (ectp preg NOS w int preg). The mapping is a direct match.

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.