A01

Non-Billable
ChapterA00–B99
Rankcategory
Official Description

Typhoid and paratyphoid fevers

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use Additional Code
  • code to identify resistance to antimicrobial drugs (Z16.-)

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)
A00-A09Intestinal infectious diseases (A00-A09)
A01Typhoid and paratyphoid fevers
A01.0Typhoid fever
A01.1Paratyphoid fever A
A01.2Paratyphoid fever B
A01.3Paratyphoid fever C
A01.4Paratyphoid fever, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A01:

chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to A01. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths
Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)1 unique routes
post-typhoid→A01
Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)4 unique routes
due to or associated with(2 variants)
paratyphoid fever (see also category M01)→A01
typhoid fever→A01
in (due to)(2 variants)
paratyphoid fever→A01
typhoid fever→A01
Cholangiolitis (acute) (chronic) (extrahepatic) (gangrenous) (intrahepatic)1 unique routes
typhoidal→A01
Cholecystitis2 unique routes
paratyphoidal, current→A01
typhoidal→A01
Choledocholithiasis (common duct) (hepatic duct)1 unique routes
typhoidal→A01
Eberth's disease (typhoid fever)1 unique routes
Direct index entry→A01
Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)2 unique routes
due to
typhoid (fever)→A01
typhoid→A01
Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)1 unique routes
typhosa→A01
Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)12 unique routes
enteric→A01
gastroenteric→A01
paratyphoid→A01(4 variants)
A→A01
B→A01
C→A01
typhogastric→A01
typhoid (abortive) (hemorrhagic) (intermittent) (malignant)→A01(5 variants)
complicated by(4 variants)
arthritis→A01
heart involvement→A01
meningitis→A01
osteomyelitis→A01

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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