2026 ICD-10-CM Diagnosis Code O34.212Maternal care for vertical scar from previous cesarean delivery

ICD-10-CM Codes›O00-O9A›O30-O48›O34

ICD-10-CM O34.212
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O34.212 is a billable ICD-10-CM diagnosis code for maternal care for vertical scar from previous cesarean delivery. 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 Previous C-section.

Code Identity

ICD-10-CM Code
O34.212
Billable Status
Yes — Valid for Submission
Code Describes
Maternal care for vertical scar from previous cesarean delivery
Short Description
Maternal care for vertical scar from previous cesarean del
Parent Code
O34.21
Maternal care for scar from previous cesarean delivery

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 CodeO34.212Maternal care for vertical scar from previous cesarean delivery

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O34.212.

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).

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Maternal care for classical scar from previous cesarean delivery

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.

    • Cesarean delivery, previous, affecting management of pregnancy
      • classical (vertical) scar
    • Delivery(childbirth) (labor)
      • cesarean (for)
        • previous
          • cesarean delivery
            • classical (vertical) scar
    • Delivery(childbirth) (labor)
      • cesarean (for)
        • scar (s)
          • cesarean delivery
            • classical (vertical)
    • Delivery(childbirth) (labor)
      • vaginal, following previous cesarean delivery
        • classical (vertical) scar

Clinical ClassificationClinical

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

CCSR PRG016
Previous C-section
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Cesarean Delivery

A cesarean delivery, also called a cesarean section or c-section, is surgery to deliver a baby. The baby is taken out through your abdomen (belly). In the United States, almost one in three babies are born this way. Some cesarean deliveries are planned.

The full article covers:

  • What is a cesarean delivery?
  • When is a cesarean delivery needed?
  • How is a cesarean delivery done?
  • What are the risks of a cesarean delivery?

Read the full article at MedlinePlus

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

Convert O34.212 to ICD-9-CMHistory

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

ICD-9-CM
654.21 Prev c-delivery-delivrd
Approximate The match is approximate rather than exact.
ICD-9-CM
654.23 Prev c-delivery-antepart
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement O34.212 replaces the following previously assigned code(s):

  • O34.21 - Maternal care for scar from previous cesarean delivery
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 O34.212Overview

Is O34.212 (Maternal care for scar from previous cesarean delivery) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report maternal care for vertical scar from previous cesarean delivery on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O34.212 group to?

When maternal care for vertical scar from previous cesarean delivery 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 O34.212 be reported for?

The Medicare Code Editor checks maternal care for vertical scar from previous cesarean delivery 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 O34.212?

Under the General Equivalence Mappings, maternal care for vertical scar from previous cesarean delivery converts to ICD-9-CM 654.21 (prev c-delivery-delivrd) and 654.23 (prev c-delivery-antepart). 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.