2026 ICD-10-CM Diagnosis Code P78.3Noninfective neonatal diarrhea

ICD-10-CM Codes›P00–P96›P76-P78›P78

ICD-10-CM P78.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P78.3 is a billable ICD-10-CM diagnosis code for noninfective neonatal diarrhea. 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 Neonatal digestive and feeding disorders.

Code Identity

ICD-10-CM Code
P78.3
Billable Status
Yes — Valid for Submission
Code Describes
Noninfective neonatal diarrhea
Short Description
Noninfective neonatal diarrhea
Same as the full description in the CMS dataset.
Parent Code
P78
Other perinatal digestive system disorders

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP76-P78Digestive system disorders of newborn
CategoryP78Other perinatal digestive system disorders
This CodeP78.3Noninfective neonatal diarrhea

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute diarrhea
  • Congenital secretory diarrhea
  • Diarrhea
  • Diarrhea and vomiting
  • Diarrhea symptom
  • Diarrheal disorder
  • Digestive symptom
  • Hemorrhagic diarrhea
  • Hypokalemic alkalosis
  • Hypokalemic alkalosis due to diarrhea
  • Infantile erythroderma, failure to thrive and diarrhea syndrome
  • Inflammatory diarrhea
  • Neonatal diarrhea
  • Non-infective diarrhea
  • Non-infective neonatal diarrhea
  • Protracted diarrhea
  • Secretory diarrhea
  • Severe diarrhea

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Neonatal diarrhea NOS

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.

    • Diarrhea, diarrheal(disease) (infantile) (inflammatory)
      • neonatal (noninfectious)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PNL012
Neonatal digestive and feeding disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Diarrhea

    an increased liquidity or decreased consistency of feces, such as running stool. fecal consistency is related to the ratio of water-holding capacity of insoluble solids to total water, rather than the amount of water present. diarrhea is not hyperdefecation or increased fecal weight.

  • Diarrhea Virus 1, Bovine Viral

    a species of pestivirus causing systemic infections (bovine virus diarrhea-mucosal disease) in cattle and some other cloven-hoofed animals. there are several strains and two biotypes: cytopathic (rare) and non-cytopathic. infections range from clinically inapparent to severe, but do not correlate with biotypes.

  • Diarrhea Virus 2, Bovine Viral

    a species of pestivirus causing systemic infections including bovine virus diarrhea-mucosal disease and bovine hemorrhagic syndrome in cattle and some other cloven-hoofed animals. there are several strains and two biotypes: cytopathic (rare) and non-cytopathic. the severity of disease appears to be strain dependent. cytopathogenic effects do not correlate with virulence as non-cytopathic bvdv-2 is associated only with hemorrhagic disease, bovine.

  • Diarrhea Viruses, Bovine Viral

    a group of viruses in the genus pestivirus, causing diarrhea, fever, oral ulcerations, hemorrhagic syndrome, and various necrotic lesions among cattle and other domestic animals. the two species (genotypes), bvdv-1 and bvdv-2 , exhibit antigenic and pathological differences. the historical designation, bvdv, consisted of both (then unrecognized) genotypes.

  • Diarrhea, Infantile

    diarrhea occurring in infants from newborn to 24-months old.

  • Dysentery

    acute inflammation of the intestine associated with infectious diarrhea of various etiologies, generally acquired by eating contaminated food containing toxins, biological derived from bacteria or other microorganisms. dysentery is characterized initially by watery feces then by bloody mucoid stools. it is often associated with abdominal pain; fever; and dehydration.

  • Feces

    excrement from the intestines, containing unabsorbed solids, waste products, secretions, and bacteria of the digestive system.

Patient EducationClinical

Diarrhea

Diarrhea is loose, watery stools (bowel movements). You have diarrhea if you have loose stools three or more times in one day. Acute diarrhea is diarrhea that lasts a short time. It is a common problem. It usually lasts about one or two days, but it may last longer. Then it goes away on its own.

The full article covers:

  • What is diarrhea?
  • What causes diarrhea?
  • Who is at risk for diarrhea?
  • What other symptoms might I have with diarrhea?
  • When do I need to see a health care provider for diarrhea?
  • How is the cause of diarrhea diagnosed?
  • What are the treatments for diarrhea?
  • Can diarrhea be prevented?

Read the full article at MedlinePlus

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

Convert P78.3 to ICD-9-CMHistory

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

ICD-9-CM
777.8 Perinat GI sys dis 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 P78.3Overview

Is P78.3 (Other perinatal digestive system disorders) a billable code?

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

What is the ICD-9 equivalent of P78.3?

Under the General Equivalence Mappings, noninfective neonatal diarrhea converts to ICD-9-CM 777.8 (perinat GI sys dis NEC). 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.