2026 ICD-10-CM Diagnosis Code A01.4Paratyphoid fever, unspecified

ICD-10-CM Codes›A00–B99›A00-A09›A01

ICD-10-CM A01.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A01.4 is a billable ICD-10-CM diagnosis code for paratyphoid fever, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. Coders also document this condition as eruption of skin caused by Salmonella. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Intestinal infection.

Code Identity

ICD-10-CM Code
A01.4
Billable Status
Yes — Valid for Submission
Code Describes
Paratyphoid fever, unspecified
Short Description
Paratyphoid fever, unspecified
Same as the full description in the CMS dataset.
Parent Code
A01
Typhoid and paratyphoid fevers

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA01Typhoid and paratyphoid fevers
This CodeA01.4Paratyphoid fever, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Eruption of skin caused by Salmonella
  • Eruption of skin caused by Salmonella Paratyphi
  • Paratyphoid fever

Tabular List NotesGuidance

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

Inclusion Terms

  • Infection due to Salmonella paratyphi 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.

    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • due to or associated with
        • paratyphoid fever (see also category M01)
    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • in (due to)
        • paratyphoid fever
    • Cholecystitis
      • paratyphoidal, current
    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • paratyphoid
    • Infection, infected, infective(opportunistic)
      • Bacillus
        • paratyphoid, paratyphosus
    • Infection, infected, infective(opportunistic)
      • Bacterium
        • paratyphosum
    • Infection, infected, infective(opportunistic)
      • Parastrongylus
        • paratyphoid
    • Infection, infected, infective(opportunistic)
      • Salmonella (aertrycke) (arizonae) (cholerae-suis) (enteritidis) (gallinarum) (suipestifer) (typhimurium)
        • paratyphi
    • Schottmuller's disease

Clinical ClassificationClinical

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

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG001
Intestinal infection
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Paratyphoid Fever

    a prolonged febrile illness commonly caused by several paratyphi serotypes of salmonella enterica. it is similar to typhoid fever but less severe.

  • Paratyphoid Fever

    a condition resembling typhoid fever that is caused by infection by salmonella enterica serovar parathyphi.

  • Paratyphoid Fever A

    paratyphoid fever that is caused by infection with salmonella enterica, serovar paratyphi a.

  • Paratyphoid Fever B

    paratyphoid fever that is caused by infection with salmonella enterica, serovar paratyphi b.

  • Paratyphoid Fever C

    paratyphoid fever that is caused by infection with salmonella enterica, serovar paratyphi c.

Patient EducationClinical

Salmonella Infections

Salmonella is the name of a group of bacteria. In the United States, it is a common cause of foodborne illness. Salmonella occurs in raw poultry, eggs, beef, and sometimes on unwashed fruit and vegetables. You also can get infected after handling pets, especially reptiles like snakes, turtles, and lizards.

Read the full article at MedlinePlus

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

Convert A01.4 to ICD-9-CMHistory

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

ICD-9-CM
002.9 Paratyphoid fever 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 A01.4Overview

Is A01.4 (Typhoid and paratyphoid fevers) a billable code?

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

What MS-DRG does A01.4 group to?

When paratyphoid fever, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A01.4?

Under the General Equivalence Mappings, paratyphoid fever, unspecified converts to ICD-9-CM 002.9 (paratyphoid fever 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.