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A01.03 ICD-10-CM Code: Typhoid pneumonia

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Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Risk adjustment
CMS-HCC V22 category 115

What these terms mean →

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

The tabular list publishes no instructional note for this code itself.

Where it sits Source: CMS/NCHS

Under:Chapter 1: Certain Infectious and Parasitic DiseasesA00-A09 Intestinal infectious diseasesA01 Typhoid and paratyphoid feversA01.0 Typhoid fever

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Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 867 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH MCC (MDC 18)
  • MS-DRG 868 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH CC (MDC 18)
  • MS-DRG 869 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITHOUT CC/MCC (MDC 18)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Don’t confuse A01.03 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of A01.03 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • A01.00— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Typhoid fever, unspecified” takes A01.00; specificity in the record moves it back here.

    Full comparison: A01.03 vs A01.00 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Typhoid pneumonia is a billable ICD-10-CM diagnosis code (A01.03).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name A01.03 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes1 note: J17 — Pneumonia in diseases classified elsewhere.

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 6 Excludes2 notes: P35 — Congenital viral diseases (via A01.-), P35-P39 — Infections specific to the perinatal period (P35-P39) (via A01.-), P36 — Bacterial sepsis of newborn (via A01.-), P37 — Other congenital infectious and parasitic diseases (via A01.-), P38 — Omphalitis of newborn (via A01.-), P39 — Other infections specific to the perinatal period (via A01.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 1 Code First instruction: M49 — Spondylopathies in diseases classified elsewhere (via A01.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 11 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 867 (MDC 18), DRG 868 (MDC 18), DRG 869 (MDC 18).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):RSP002 — Pneumonia (except that caused by tuberculosis) (default); INF003 — Bacterial infections.

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

A01.00 — Typhoid fever, unspecified, A01.01 — Typhoid meningitis, A01.02 — Typhoid fever with heart involvement, A01.04 — Typhoid arthritis, A01.05 — Typhoid osteomyelitis, A01.09 — Typhoid fever with other complications, A01.1 — Paratyphoid fever A, A01.2 — Paratyphoid fever B, A01.3 — Paratyphoid fever C, A01.4 — Paratyphoid fever, unspecified

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical categories (Pneumonia (except that caused by tuberculosis), Bacterial infections).

A02.22 — Salmonella pneumonia, A20.2 — Pneumonic plague, A21.2 — Pulmonary tularemia, A22.1 — Pulmonary anthrax, A31.0 — Pulmonary mycobacterial infection, A37.01 — Whooping cough due to Bordetella pertussis with pneumonia, A37.11 — Whooping cough due to Bordetella parapertussis with pneumonia, A37.81 — Whooping cough due to other Bordetella species with pneumonia, A37.91 — Whooping cough, unspecified species with pneumonia, A43.0 — Pulmonary nocardiosis, A48.1 — Legionnaires' disease, A50.04 — Early congenital syphilitic pneumonia, A52.72 — Syphilis of lung and bronchus, A54.84 — Gonococcal pneumonia, B01.2 — Varicella pneumonia, B05.2 — Measles complicated by pneumonia, B06.81 — Rubella pneumonia, B25.0 — Cytomegaloviral pneumonitis, B37.1 — Pulmonary candidiasis, B38.0 — Acute pulmonary coccidioidomycosis, +418 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Pneumonia”, “Fever”; these codes share that main term but sit in a different category of the Tabular List.

A02.22 — Salmonella pneumonia (Salmonella), A02.8 — Other specified salmonella infections (swine), A20.2 — Pneumonic plague (in, Yersinia pestis), A21.2 — Pulmonary tularemia (tularemic), A22.1 — Pulmonary anthrax (anthrax), A23.1 — Brucellosis due to Brucella abortus (abortus), A23.9 — Brucellosis, unspecified (Malta), A24.1 — Acute and fulminating melioidosis (in, Pseudomonas NEC, pseudomallei), A25.0 — Spirillosis (spirillary), A25.1 — Streptobacillosis (Haverhill), A25.9 — Rat-bite fever, unspecified (rat-bite), A27.0 — Leptospirosis icterohemorrhagica (icterohemorrhagic), A27.89 — Other forms of leptospirosis (pretibial), A27.9 — Leptospirosis, unspecified (mud), A28.1 — Cat-scratch disease (cat-scratch), A37.01 — Whooping cough due to Bordetella pertussis with pneumonia (in, whooping cough, due to, Bordetella pertussis), A37.11 — Whooping cough due to Bordetella parapertussis with pneumonia (in, whooping cough, due to, Bordetella parapertussis), A37.81 — Whooping cough due to other Bordetella species with pneumonia (in, whooping cough, due to, specified NEC), A37.91 — Whooping cough, unspecified species with pneumonia (in, whooping cough), A38.9 — Scarlet fever, uncomplicated (scarlet), +198 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Iron Panel, Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of A01.03 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run A01.03 with these 8 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes

Referenced by Code First instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 18 — Infectious and Parasitic Diseases, Systemic or Unspecified Sites[MDC crossing]: “Infectious and Parasitic Diseases, Systemic or Unspecified Sites — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 1 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor), typhoid (abortive) (hemorrhagic) (intermittent) (malignant), complicated by, pneumonia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved), in (due to), Salmonella (infection), typhi[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved), in (due to), typhoid (fever)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved), Salmonella (arizonae) (cholerae-suis) (enteritidis) (typhimurium), typhi[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved), Salmonella (arizonae) (cholerae-suis) (enteritidis) (typhimurium), typhoid fever[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Typhoid (abortive) (ambulant) (any site) (clinical) (fever) (hemorrhagic) (infection) (intermittent) (malignant) (rheumatic) (Widal negative), pneumonia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Typhoid (abortive) (ambulant) (any site) (clinical) (fever) (hemorrhagic) (infection) (intermittent) (malignant) (rheumatic) (Widal negative), with pneumonia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (12)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (7)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "A01.03 — Typhoid pneumonia." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/a01.03-typhoid-pneumonia

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Typhoid pneumonia

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to A01.03 in its code family, with their registry titles.

View all codes in the A01 family