2026 ICD-10-CM Diagnosis Code P29.12Neonatal bradycardia

ICD-10-CM Codes›P00–P96›P19-P29›P29

ICD-10-CM P29.12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P29.12 is a billable ICD-10-CM diagnosis code for neonatal bradycardia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such abnormalities of heart rhythm.

Code Identity

ICD-10-CM Code
P29.12
Billable Status
Yes — Valid for Submission
Code Describes
Neonatal bradycardia
Short Description
Neonatal bradycardia
Same as the full description in the CMS dataset.
Parent Code
P29.1
Neonatal cardiac dysrhythmia

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 CodeP29.12Neonatal bradycardia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal pulse rate
  • Asymptomatic bradycardia
  • AV-junctional bradycardia
  • Borderline slow pulse
  • Bradycardia
  • Bradycardic cardiac arrest
  • Drug-induced bradycardia
  • Finding of pulse rate
  • Neonatal bradycardia
  • Neonatal dysrhythmia
  • Persistent sinus bradycardia
  • Pulse slow
  • Reflex bradycardia
  • Severe sinus bradycardia
  • Sinus bradycardia
  • Sinus bradycardia caused by drug
  • Stable bradyarrhythmia
  • Symptomatic sinus bradycardia
  • Vagal autonomic bradycardia

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.

    • Arrhythmia(auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)
      • newborn
        • bradycardia
    • Bradycardia(sinoatrial) (sinus) (vagal)
      • neonatal
    • Dysrhythmia
      • cardiac
        • newborn
          • bradycardia
    • Neonatal
      • bradycardia
    • Newborn(infant) (liveborn) (singleton)
      • affected by
        • heart rate abnormalities
          • bradycardia

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

  • Bradycardia

    cardiac arrhythmias that are characterized by excessively slow heart rate, usually below 50 beats per minute in human adults. they can be classified broadly into sinoatrial node dysfunction and atrioventricular block.

  • Cardiomegaly, Exercise-Induced

    non-pathological heart enlargement and other remodeling in cardiac morphology and electrical circuitry found in individuals who participate in intense repeated exercises.

  • Bradycardia

    an abnormally slow heart rate. thresholds for different age, sex, and patient populations exist.

  • Bradycardia by ECG Finding|BRADYCARDIA|Bradycardia|Bradycardia|Bradycardia by EKG Finding

    an electrocardiographic finding of abnormally slow heart rate. thresholds for different age, sex, and patient populations exist.

  • Sinus Bradycardia by ECG Finding|SINUS BRADYCARDIA|Sinus Bradycardia|Sinus Bradycardia by EKG Finding|Sinus bradycardia

    an electrocardiographic finding of abnormally slow heart rate with its origin in the sinus node. thresholds for different age, sex, and patient populations exist.

  • Sinus Bradycardia|Sinus bradycardia

    a condition characterized by an electrocardiographic finding of abnormally slow heart rate with its origin in the sinus node. thresholds for different age, sex, and patient populations exist.

  • Bradycardia

    an abnormally slow heart rate. thresholds for different age, gender, and patient populations exist.

  • Bradycardia Arrest

    cardiac arrest that was a result of bradycardia.

  • Fetal Bradycardia|Baseline Fetal Bradycardia|Baseline Fetal Bradycardia|Bradycardia Fetal

    a fetal heart rate below 110 bpm that is sustained for longer than 10 minutes.

  • Grade 1 Neonatal Sinus Bradycardia, AE|Grade 1 Neonatal Sinus Bradycardia|Grade 1 Neonatal Sinus Bradycardia, Adverse Event

    an adverse event in a newborn characterized by brief, self-limiting, episodes of sinus bradycardia; no care changes.

  • Grade 1 Sinus Bradycardia, CTCAE|Grade 1 Sinus bradycardia|Grade 1 Sinus bradycardia

    asymptomatic, intervention not indicated

  • Grade 2 Neonatal Sinus Bradycardia, AE|Grade 2 Neonatal Sinus Bradycardia|Grade 2 Neonatal Sinus Bradycardia, Adverse Event

    an adverse event in a newborn characterized by persistent sinus bradycardia; no change in age-appropriate behavior; requiring minor care changes (e.g. concomitant medication adapted, intermittent increase of fraction of inspired oxygen (fio2)).

  • Grade 2 Sinus Bradycardia, CTCAE|Grade 2 Sinus bradycardia|Grade 2 Sinus bradycardia

    symptomatic, intervention not indicated; change in medication initiated

  • Grade 3 Neonatal Sinus Bradycardia, AE|Grade 3 Neonatal Sinus Bradycardia|Grade 3 Neonatal Sinus Bradycardia, Adverse Event

    an adverse event in a newborn characterized by persistent sinus bradycardia; resulting in non-life threatening hemodynamic compromise; requiring major care changes (e.g. new medication or intervention).

  • Grade 3 Sinus Bradycardia, CTCAE|Grade 3 Sinus bradycardia|Grade 3 Sinus bradycardia

    symptomatic, intervention indicated

  • Grade 4 Neonatal Sinus Bradycardia, AE|Grade 4 Neonatal Sinus Bradycardia|Grade 4 Neonatal Sinus Bradycardia, Adverse Event

    a sinus bradycardia adverse event in a newborn characterized by life-threatening consequences (e.g. shock); requiring urgent major care changes.

  • Grade 4 Sinus Bradycardia, CTCAE|Grade 4 Sinus bradycardia|Grade 4 Sinus bradycardia

    life-threatening consequences; urgent intervention indicated

  • Grade 5 Neonatal Sinus Bradycardia, AE|Grade 5 Neonatal Sinus Bradycardia|Grade 5 Neonatal Sinus Bradycardia, Adverse Event

    a sinus bradycardia adverse event in a newborn which results in death.

  • Grade 5 Sinus Bradycardia, CTCAE|Grade 5 Sinus bradycardia|Grade 5 Sinus bradycardia

    death

  • Junctional Bradycardia by ECG Finding|JUNCTIONAL BRADYCARDIA|Junctional Bradycardia|Junctional Bradycardia by EKG Finding|Junctional bradycardia

    an electrocardiographic finding of a junctional rhythm with a heat rate which is abnormally low. (cdisc)

  • Marked Sinus Bradycardia by ECG Finding|MARKED SINUS BRADYCARDIA

    an electrocardiographic tracing demonstrating sinus bradycardia, with a heart rate lower than an acceptable, predetermined threshold. different thresholds, for rate and/or duration, may apply to different patient populations.

  • Neonatal Sinus Bradycardia, AE|Neonatal Sinus Bradycardia|Neonatal Sinus Bradycardia, Adverse Event|Neonatal sinus bradycardia

    an adverse event in a newborn characterized by an abnormally low heart rate for age.

  • Persistent Fetal Bradycardia

    a decrease in the fetal heart beat rate below 110 per minute or below the normal baseline value expected for the particular fetal age for a period of more than 10 minutes.

  • Sinus Bradycardia by ECG Finding|SINUS BRADYCARDIA|Sinus Bradycardia|Sinus Bradycardia by EKG Finding|Sinus bradycardia

    an electrocardiographic finding of abnormally slow heart rate with its origin in the sinus node. thresholds for different age, gender, and patient populations exist. (cdisc)

  • Sinus Bradycardia, CTCAE|Sinus Bradycardia|Sinus bradycardia|Sinus bradycardia

    a disorder characterized by a dysrhythmia with a heart rate less than 60 beats per minute that originates in the sinus node.

  • Sinus Bradycardia|Sinus bradycardia

    a disorder characterized by an electrocardiographic finding of abnormally slow heart rate with its origin in the sinus node. thresholds for different age, gender, and patient populations exist. (cdisc)

Patient EducationClinical

Arrhythmia

An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart beats too quickly, too slowly, or with an irregular pattern. Changes in the electrical signals that control your heartbeat cause arrhythmias.

The full article covers:

  • What is an arrhythmia?
  • What causes an arrhythmia?
  • What are the symptoms of an arrhythmia?
  • How is an arrhythmia diagnosed?
  • What are the treatments for an arrhythmia?
  • Can arrhythmias be prevented?

Read the full article at MedlinePlus

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

Convert P29.12 to ICD-9-CMHistory

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

ICD-9-CM
779.81 Neonatal bradycardia
Exact Match The mapping is direct, with no qualifiers.

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 P29.12Overview

Is P29.12 (Neonatal cardiac dysrhythmia) a billable code?

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

What is the ICD-9 equivalent of P29.12?

Under the General Equivalence Mappings, neonatal bradycardia converts to ICD-9-CM 779.81 (neonatal bradycardia). The mapping is a direct match.

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.