2026 ICD-10-CM Diagnosis Code O98.412Viral hepatitis complicating pregnancy, second trimester

ICD-10-CM Codes›O00-O9A›O94-O9A›O98

ICD-10-CM O98.412
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O98.412 is a billable ICD-10-CM diagnosis code for viral hepatitis complicating pregnancy, 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 Hepatitis and Other specified complications in pregnancy.

Code Identity

ICD-10-CM Code
O98.412
Billable Status
Yes — Valid for Submission
Code Describes
Viral hepatitis complicating pregnancy, second trimester
Short Description
Viral hepatitis complicating pregnancy, second trimester
Same as the full description in the CMS dataset.
Parent Code
O98.41
Viral hepatitis complicating pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO94-O9AOther obstetric conditions, not elsewhere classified
CategoryO98Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
This CodeO98.412Viral hepatitis complicating pregnancy, second trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O98.412.

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 INF007
Hepatitis
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG028
Other specified complications in pregnancy
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Hepatitis

Hepatitis is inflammation of the liver. Inflammation is swelling that happens when tissues of the body are injured or infected. It can damage your liver. This swelling and damage can affect how well your liver functions.

The full article covers:

  • What is hepatitis?
  • What causes hepatitis?
  • How is viral hepatitis spread?
  • Who is at risk for hepatitis?
  • What are the symptoms of hepatitis?
  • What other problems can hepatitis cause?
  • How is hepatitis diagnosed?
  • What are the treatments for hepatitis?

Read the full article at MedlinePlus

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

Convert O98.412 to ICD-9-CMHistory

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

ICD-9-CM
647.61 Oth viral dis-delivered
Approximate The match is approximate rather than exact.
ICD-9-CM
647.63 Oth viral dis-antepartum
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 O98.412Overview

Is O98.412 (Viral hepatitis complicating pregnancy) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report viral hepatitis complicating pregnancy, second trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O98.412 group to?

When viral hepatitis complicating pregnancy, 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 O98.412 be reported for?

The Medicare Code Editor checks viral hepatitis complicating 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.

What is the ICD-9 equivalent of O98.412?

Under the General Equivalence Mappings, viral hepatitis complicating pregnancy, second trimester converts to ICD-9-CM 647.61 (oth viral dis-delivered) and 647.63 (oth viral dis-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.