2026 ICD-10-CM Diagnosis Code P29.4Transient myocardial ischemia in newborn

ICD-10-CM Codes›P00–P96›P19-P29›P29

ICD-10-CM P29.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P29.4 is a billable ICD-10-CM diagnosis code for transient myocardial ischemia in newborn. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 794. Coders also document this condition as acute myocardial ischemia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

Code Identity

ICD-10-CM Code
P29.4
Billable Status
Yes — Valid for Submission
Code Describes
Transient myocardial ischemia in newborn
Short Description
Transient myocardial ischemia in newborn
Same as the full description in the CMS dataset.
Parent Code
P29
Cardiovascular disorders originating in the perinatal period

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP19-P29Respiratory and cardiovascular disorders specific to the perinatal period
CategoryP29Cardiovascular disorders originating in the perinatal period
This CodeP29.4Transient myocardial ischemia in newborn

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute myocardial ischemia
  • Myocardial ischemia of newborn
  • Transient myocardial ischemia
  • Transient myocardial ischemia of newborn

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR PNL013
Other specified and unspecified perinatal conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Transient Myocardial Ischemia of Newborn

    a condition characterized by a temporary imbalance between the oxygen supply and demand of the heart muscle in the newborn.

Patient EducationClinical

Heart Diseases

Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease.

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Read the full article at MedlinePlus

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Convert P29.4 to ICD-9-CMHistory

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

ICD-9-CM
779.89 Perinatal condition NEC
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 P29.4Overview

What is the ICD-10 code for transient myocardial ischemia in newborn?

The ICD-10-CM code for transient myocardial ischemia in newborn is P29.4 (sometimes written as P294). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is P29.4 (Cardiovascular disorders originating in the perinatal period) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report transient myocardial ischemia in newborn on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does P29.4 group to?

When transient myocardial ischemia in newborn is the principal diagnosis on an inpatient stay, it groups to MS-DRG 794 (neonate with Other Significant Problems), which carries a relative weight of 1.4759. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of P29.4?

Under the General Equivalence Mappings, transient myocardial ischemia in newborn converts to ICD-9-CM 779.89 (perinatal condition NEC). The mapping is approximate, so confirm the match fits the documentation.