2026 ICD-10-CM Diagnosis Code O34.12Maternal care for benign tumor of corpus uteri, second trimester

ICD-10-CM Codes›O00-O9A›O30-O48›O34

ICD-10-CM O34.12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O34.12 is a billable ICD-10-CM diagnosis code for maternal care for benign tumor of corpus uteri, second trimester. 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 Maternal care for abnormality of pelvic organs.

Code Identity

ICD-10-CM Code
O34.12
Billable Status
Yes — Valid for Submission
Code Describes
Maternal care for benign tumor of corpus uteri, second trimester
Short Description
Maternal care for benign tumor of corpus uteri, second tri
Parent Code
O34.1
Maternal care for benign tumor of corpus uteri

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO34Maternal care for abnormality of pelvic organs
This CodeO34.12Maternal care for benign tumor of corpus uteri, second trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O34.12.

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 PRG017
Maternal care for abnormality of pelvic organs
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Benign Tumors

Tumors are abnormal growths in your body. They can be either benign or malignant. Benign tumors aren't cancer. Malignant ones are. Benign tumors grow only in one place. They cannot spread or invade other parts of your body. Even so, they can be dangerous if they press on vital organs, such as your brain.

Read the full article at MedlinePlus

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

Convert O34.12 to ICD-9-CMHistory

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

ICD-9-CM
654.11 Uterine tumor-delivered
Approximate The match is approximate rather than exact.
ICD-9-CM
654.12 Uterine tumor-del w p/p
Approximate The match is approximate rather than exact.
ICD-9-CM
654.13 Uterine tumor-antepartum
Approximate The match is approximate rather than exact.
ICD-9-CM
654.14 Uterine tumor-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 O34.12Overview

Is O34.12 (Maternal care for benign tumor of corpus uteri) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report maternal care for benign tumor of corpus uteri, second trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O34.12 group to?

When maternal care for benign tumor of corpus uteri, second trimester 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 O34.12 be reported for?

The Medicare Code Editor checks maternal care for benign tumor of corpus uteri, second trimester 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 O34.12?

Under the General Equivalence Mappings, maternal care for benign tumor of corpus uteri, second trimester converts to ICD-9-CM 654.11 (uterine tumor-delivered), 654.12 (uterine tumor-del w p/p), and 654.13 (uterine tumor-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.