2026 ICD-10-CM Diagnosis Code P78.9Perinatal digestive system disorder, unspecified

ICD-10-CM Codes›P00–P96›P76-P78›P78

ICD-10-CM P78.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P78.9 is a billable ICD-10-CM diagnosis code for perinatal digestive system disorder, unspecified. 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
P78.9
Billable Status
Yes — Valid for Submission
Code Describes
Perinatal digestive system disorder, unspecified
Short Description
Perinatal digestive system disorder, unspecified
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 CodeP78.9Perinatal digestive system disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute digestive system disorder
  • Disorder of digestive organ
  • Disorder of digestive system
  • Disorder of digestive system specific to fetus OR newborn
  • Disorder of digestive tract
  • Disorder of gastrointestinal tract
  • Disorder of gastrointestinal tract co-occurrent with human immunodeficiency virus infection
  • Disorder of lower gastrointestinal tract
  • Disorder of upper digestive tract
  • Disorder of upper gastrointestinal tract
  • Gastrointestinal complication
  • Gastrointestinal tract disease treatment started
  • Gastrointestinal tract problem
  • Gastrointestinal tract treatment changed
  • Neonatal gastrointestinal disorder
  • Perinatal disorders of liver and/or biliary system

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.

    • Disorder(of)
      • digestive (system)
        • newborn
    • Disorder(of)
      • gastrointestinal (functional) NOS
        • newborn

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

Patient EducationClinical

Digestive Diseases

When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion.

Read the full article at MedlinePlus

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

Convert P78.9 to ICD-9-CMHistory

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

ICD-9-CM
777.9 Perinat GI sys dis NOS
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 P78.9Overview

Is P78.9 (Other perinatal digestive system disorders) a billable code?

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

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

Under the General Equivalence Mappings, perinatal digestive system disorder, unspecified converts to ICD-9-CM 777.9 (perinat GI sys dis NOS). 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.