2027 ICD-10-CM Diagnosis Code P29.81Cardiac arrest of newborn
ICD-10-CM Codes›P00–P96›P19-P29›P29
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 213
- Not Chronic
P29.81 is a billable ICD-10-CM diagnosis code for cardiac arrest of newborn. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 1 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.
For Medicare Advantage risk adjustment, P29.81 maps to CMS-HCC Category 213 (Cardio-Respiratory Failure and Shock) under the V28 model, adding a risk factor of about 0.370 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
P29.81 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anoxic encephalopathy
- Anoxic encephalopathy due to cardiac arrest
- Asystole
- Atrial standstill
- Bradycardic cardiac arrest
- Cardiac arrest
- Cardiac arrest with successful resuscitation
- Cardiorespiratory arrest
- Circulatory arrest
- EKG: asystole
- Hypoxic ischemic encephalopathy
- Hypoxic ischemic encephalopathy due to cardiac arrest
- Hypoxic-ischemic coma
- Idiopathic cardiac arrest
- In-hospital cardiac arrest
- Neonatal cardiac arrest
- Neonatal cardiorespiratory arrest
- Neonatal dysrhythmia
- Neonatal respiratory arrest
- Neonatal respiratory failure
- Out-of-hospital cardiac arrest
- Post-cardiorespiratory arrest coma
- Respiratory arrest
- Respiratory insufficiency syndrome of newborn
- Sinus arrest
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to P29.81: 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.
- 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.
Notes
General instructions on how these codes are used.
- 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 P29.81, its category, or a range that includes it.
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.
Patient EducationClinical
Sudden Cardiac Arrest
Sudden cardiac arrest (SCA) is a condition in which the heart suddenly stops beating. When that happens, blood stops flowing to the brain and other vital organs. If it is not treated, SCA usually causes death within minutes. But quick treatment with cardiopulmonary resuscitation (CPR) and a defibrillator may be lifesaving.
The full article covers:
- What is sudden cardiac arrest (SCA)?
- How is sudden cardiac arrest (SCA) different from a heart attack?
- What causes sudden cardiac arrest (SCA)?
- Who is at risk for sudden cardiac arrest (SCA)?
- What are the symptoms of sudden cardiac arrest (SCA)?
- How is sudden cardiac arrest (SCA) diagnosed?
- What are the treatments for sudden cardiac arrest (SCA)?
- What should I do if I think that someone has had an SCA?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert P29.81 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About P29.81Overview
What is the ICD-10 code for cardiac arrest of newborn?
The ICD-10-CM code for cardiac arrest of newborn is P29.81 (sometimes written as P2981). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is P29.81 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report cardiac arrest of newborn on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does P29.81 group to?
When cardiac arrest of newborn is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, with relative weights from 4.1073 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is P29.81 a CC or MCC?
CMS lists P29.81 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 1 closely related codes in its exclusion list.
What is the ICD-9 equivalent of P29.81?
Under the General Equivalence Mappings, cardiac arrest of newborn converts to ICD-9-CM 779.85 (NB cardiac arrest). The mapping is a direct match.
What HCC is P29.81?
P29.81 (cardiac arrest of newborn) maps to CMS-HCC Category 213 (Cardio-Respiratory Failure and Shock), commonly written as HCC 213, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It does not map to any RxHCC in the Part D prescription drug model.
Does P29.81 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, P29.81 adds a risk adjustment factor of about 0.370 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.258 to 0.662 depending on the payment segment). A more severe related category (HCC 211 and HCC 212) supersedes it when both are reported. See the full factor table on the HCC 213 category page.
