2026 ICD-10-CM Diagnosis Code O00.212Left ovarian pregnancy with intrauterine pregnancy

ICD-10-CM Codes›O00-O9A›O00-O08›O00

ICD-10-CM O00.212
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O00.212 is a billable ICD-10-CM diagnosis code for left ovarian 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). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Ectopic pregnancy and complications of ectopic pregnancy.

Code Identity

ICD-10-CM Code
O00.212
Billable Status
Yes — Valid for Submission
Code Describes
Left ovarian pregnancy with intrauterine pregnancy
Short Description
Left ovarian pregnancy with intrauterine pregnancy
Same as the full description in the CMS dataset.
Parent Code
O00.21
Ovarian pregnancy with intrauterine pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO00-O08Pregnancy with abortive outcome
CategoryO00Ectopic pregnancy
This CodeO00.212Left ovarian pregnancy with intrauterine pregnancy

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O00.212.

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).

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

Convert O00.212 to ICD-9-CMHistory

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

ICD-9-CM
633.21 Ovarian preg w intra prg
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement O00.212 replaces the following previously assigned code(s):

  • O00.21 - Ovarian pregnancy with intrauterine pregnancy
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 O00.212Overview

Is O00.212 (Ovarian pregnancy with intrauterine pregnancy) a billable code?

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

What MS-DRG does O00.212 group to?

When left ovarian 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 O00.212 be reported for?

The Medicare Code Editor checks left ovarian 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 O00.212?

Under the General Equivalence Mappings, left ovarian pregnancy with intrauterine pregnancy converts to ICD-9-CM 633.21 (ovarian preg w intra prg). 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.