2026 ICD-10-CM Diagnosis Code A01.01Typhoid meningitis

ICD-10-CM Codes›A00–B99›A00-A09›A01

ICD-10-CM A01.01
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A01.01 is a billable ICD-10-CM diagnosis code for typhoid meningitis. 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 meningitis due to typhoid fever. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Meningitis.

Code Identity

ICD-10-CM Code
A01.01
Billable Status
Yes — Valid for Submission
Code Describes
Typhoid meningitis
Short Description
Typhoid meningitis
Same as the full description in the CMS dataset.
Parent Code
A01.0
Typhoid fever

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA01Typhoid and paratyphoid fevers
This CodeA01.01Typhoid meningitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Meningitis due to typhoid fever
  • Salmonella meningitis

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.

    • Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
      • typhoid (abortive) (hemorrhagic) (intermittent) (malignant)
        • complicated by
          • meningitis
    • Meningitis(basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
      • in (due to)
        • typhoid fever
    • Meningitis(basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
      • typhoid
    • Typhoid(abortive) (ambulant) (any site) (clinical) (fever) (hemorrhagic) (infection) (intermittent) (malignant) (rheumatic) (Widal negative)
      • meningitis

Clinical ClassificationClinical

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

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient No · outpatient No
CCSR NVS001
Meningitis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Typhoid Fever

    an acute systemic febrile infection caused by salmonella typhi, a serotype of salmonella enterica.

  • 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.

  • Typhoid Fever

    a bacterial infectious disorder contracted by consumption of food or drink contaminated with salmonella typhi. this disorder is common in developing countries and can be treated with antibiotics.

Patient EducationClinical

Meningitis

Meningitis is inflammation of the thin tissue that surrounds the brain and spinal cord, called the meninges. There are several types of meningitis. The most common is viral meningitis. You get it when a virus enters the body through the nose or mouth and travels to the brain. Bacterial meningitis is rare but can be deadly.

Read the full article at MedlinePlus

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

Convert A01.01 to ICD-9-CMHistory

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

ICD-9-CM
002.0 Typhoid fever
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 A01.01Overview

Is A01.01 (Typhoid fever) a billable code?

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

What MS-DRG does A01.01 group to?

When typhoid meningitis 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 A01.01?

Under the General Equivalence Mappings, typhoid meningitis converts to ICD-9-CM 002.0 (typhoid fever). 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.