2026 ICD-10-CM Diagnosis Code P74.1Dehydration of newborn

ICD-10-CM Codes›P00–P96›P70-P74›P74

ICD-10-CM P74.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P74.1 is a billable ICD-10-CM diagnosis code for dehydration of newborn. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as cataract due to dehydration. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

Code Identity

ICD-10-CM Code
P74.1
Billable Status
Yes — Valid for Submission
Code Describes
Dehydration of newborn
Short Description
Dehydration of newborn
Same as the full description in the CMS dataset.
Parent Code
P74
Other transitory neonatal electrolyte and metabolic disturbances

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP70-P74Transitory endocrine and metabolic disorders specific to newborn
CategoryP74Other transitory neonatal electrolyte and metabolic disturbances
This CodeP74.1Dehydration of newborn

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cataract due to dehydration
  • Dehydration
  • Deprivation of water
  • Isonatremic dehydration
  • Mild dehydration
  • Moderate dehydration
  • Neonatal dehydration
  • Severe dehydration
  • Signs of dehydration

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.

    • Dehydration
      • newborn
    • Newborn(infant) (liveborn) (singleton)
      • dehydration

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

  • Dehydration

    the condition that results from excessive loss of water from a living organism.

Patient EducationClinical

Fluid and Electrolyte Balance

Electrolytes are minerals that have an electric charge when they are dissolved in water or body fluids, including blood. The electric charge can be positive or negative. You have electrolytes in your blood, urine (pee), tissues, and other body fluids.

The full article covers:

  • What are electrolytes?
  • What are the different types of electrolytes in your body?
  • What is an electrolyte imbalance?
  • What are the different types of electrolyte imbalances?
  • How are electrolyte imbalances diagnosed?
  • What are the treatments for electrolyte imbalances?

Read the full article at MedlinePlus

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

Convert P74.1 to ICD-9-CMHistory

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

ICD-9-CM
775.5 Neonatal dehydration
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 P74.1Overview

Is P74.1 a billable code?

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

What is the ICD-9 equivalent of P74.1?

Under the General Equivalence Mappings, dehydration of newborn converts to ICD-9-CM 775.5 (neonatal dehydration). The mapping is approximate, so confirm the match fits the documentation.

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.