2026 ICD-10-CM Diagnosis Code O09.A2Supervision of pregnancy with history of molar pregnancy, second trimester

ICD-10-CM Codes›O00-O9A›O09›O09

ICD-10-CM O09.A2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O09.A2 is a billable ICD-10-CM diagnosis code for supervision of pregnancy with history of molar pregnancy, second trimester. 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), not accepted as a principal diagnosis, and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Supervision of high-risk pregnancy.

Code Identity

ICD-10-CM Code
O09.A2
Billable Status
Yes — Valid for Submission
Code Describes
Supervision of pregnancy with history of molar pregnancy, second trimester
Short Description
Suprvsn of preg with history of molar preg, second trimester
Parent Code
O09.A
Supervision of pregnancy with history of molar pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO09Supervision of high risk pregnancy
CategoryO09Supervision of high risk pregnancy
This CodeO09.A2Supervision of pregnancy with history of molar pregnancy, second trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O09.A2.

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).
Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

O09.A2 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Clinical ClassificationClinical

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

CCSR PRG008
Supervision of high-risk pregnancy
Default principal diagnosis: inpatient No · outpatient Yes

Convert O09.A2 to ICD-9-CMHistory

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

ICD-9-CM
V23.1 Preg w hx-trophoblas dis
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement O09.A2 replaces the following previously assigned code(s):

  • O09.12 - Suprvsn of preg w history of ect or molar preg, second tri
  • O09.12 - Suprvsn of preg with history of ectopic preg, second tri
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 O09.A2Overview

Is O09.A2 (Supervision of pregnancy with history of molar pregnancy) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report supervision of pregnancy with history of molar pregnancy, second trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can O09.A2 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because supervision of pregnancy with history of molar pregnancy, second trimester describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Who can O09.A2 be reported for?

The Medicare Code Editor checks supervision of pregnancy with history of molar pregnancy, second trimester against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

Is O09.A2 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for supervision of pregnancy with history of molar pregnancy, second trimester on inpatient claims.

What is the ICD-9 equivalent of O09.A2?

Under the General Equivalence Mappings, supervision of pregnancy with history of molar pregnancy, second trimester converts to ICD-9-CM V23.1 (preg w hx-trophoblas dis). 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.