2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) 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
  • Neonatal myocardial ischemia
  • Transient myocardial ischemia
  • Transient myocardial ischemia of newborn

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to P29.4: its own notes plus those printed at P29 and Chapter 16. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From P29 Cardiovascular disorders originating in the perinatal period applies to 10 codes
  • congenital malformations of the circulatory system (Q20-Q28)
From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • tetanus neonatorum (A33)

Notes

General instructions on how these codes are used.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • Codes from this chapter are for use on newborn records only, never on maternal records

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name P29.4, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming P29.4: they are not reported together with it, unless the two conditions are unrelated.

  • I24 Other acute ischemic heart diseases
    transient myocardial ischemia in newborn (P29.4)

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

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.

The full article covers:

  • What is heart disease?
  • What are the types of heart disease?
  • What causes heart diseases?
  • Who is more likely to develop heart diseases?
  • What are the symptoms of heart disease?
  • How are heart diseases diagnosed?
  • What are the treatments for heart disease?
  • Can heart diseases be prevented?

Read the full article at MedlinePlus

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

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 1.4934. 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.