2026 ICD-10-CM Diagnosis Code P80.9Hypothermia of newborn, unspecified

ICD-10-CM Codes›P00–P96›P80-P83›P80

ICD-10-CM P80.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P80.9 is a billable ICD-10-CM diagnosis code for hypothermia of newborn, unspecified. 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 decreased skin temperature. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

Code Identity

ICD-10-CM Code
P80.9
Billable Status
Yes — Valid for Submission
Code Describes
Hypothermia of newborn, unspecified
Short Description
Hypothermia of newborn, unspecified
Same as the full description in the CMS dataset.
Parent Code
P80
Hypothermia of newborn

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP80-P83Conditions involving the integument and temperature regulation of newborn
CategoryP80Hypothermia of newborn
This CodeP80.9Hypothermia of newborn, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Decreased skin temperature
  • Disturbance of temperature regulation of newborn
  • Hypothermia
  • Hypothermia 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

Patient EducationClinical

Hypothermia

Cold weather can affect your body in different ways. You can get frostbite, which is an injury to the body that is caused by freezing. Your body can also lose heat faster than you can produce it. That can cause hypothermia, or abnormally low body temperature. It can make you sleepy, confused, and clumsy.

Read the full article at MedlinePlus

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

Convert P80.9 to ICD-9-CMHistory

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

ICD-9-CM
778.3 NB hypothermia 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 P80.9Overview

What is the ICD-10 code for hypothermia of newborn, unspecified?

The ICD-10-CM code for hypothermia of newborn, unspecified is P80.9 (sometimes written as P809). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is P80.9 (Hypothermia of newborn) a billable code?

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

What MS-DRG does P80.9 group to?

When hypothermia of newborn, unspecified 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 P80.9?

Under the General Equivalence Mappings, hypothermia of newborn, unspecified converts to ICD-9-CM 778.3 (NB hypothermia NEC). The mapping is approximate, so confirm the match fits the documentation.