2027 ICD-10-CM Diagnosis Code A01.03Typhoid pneumonia
ICD-10-CM Codes›A00–B99›A00-A09›A01
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A01.03 is a billable ICD-10-CM diagnosis code for typhoid pneumonia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 11 closely related codes. Coders also document this condition as infection of intestine caused by Salmonella group D. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Pneumonia (except that caused by tuberculosis).
A01.03 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 115 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 115, ESRD (V21) category 115, and ESRD (V24) category 115 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
A01.03 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Infection of intestine caused by Salmonella group D
- Pneumonia in typhoid fever
- Typhoid fever
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A01.03: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- 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
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name A01.03, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming A01.03: they are not reported together with it, unless the two conditions are unrelated.
- J17 Pneumonia in diseases classified elsewheretyphoid fever with pneumonia (A01.03)
Excludes2 2
These codes carry an Excludes2 note naming A01.03: its condition is not part of those codes, and both may be reported when the patient has both.
- Block P35-P39 Infections specific to the perinatal period
- P37 Other congenital infectious and parasitic diseases
Code First 1
These codes say to code first a condition named in the note, and A01.03 is one of the conditions named.
- M49 Spondylopathies in diseases classified elsewhere
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Typhoid Fever
an acute systemic febrile infection caused by salmonella typhi, a serotype of salmonella enterica.
Patient EducationClinical
Pneumonia
Pneumonia is an infection in one or both of your lungs. It causes the air sacs of your lungs to fill up with fluid or pus. Pneumonia can range from mild to severe, depending on what caused it, your age, and your overall health.
The full article covers:
- What is pneumonia?
- What causes pneumonia?
- Who is more likely to develop pneumonia?
- What are the symptoms of pneumonia?
- What other problems can pneumonia cause?
- How is pneumonia diagnosed?
- What are the treatments for pneumonia?
- Can pneumonia be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A01.03 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A01.03Overview
What is the ICD-10 code for typhoid pneumonia?
The ICD-10-CM code for typhoid pneumonia is A01.03 (sometimes written as A0103). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A01.03 (Typhoid fever) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report typhoid pneumonia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A01.03 group to?
When typhoid pneumonia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A01.03 a CC or MCC?
CMS lists A01.03 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 11 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A01.03?
Under the General Equivalence Mappings, typhoid pneumonia converts to ICD-9-CM 002.0 (typhoid fever). The mapping is approximate, so confirm the match fits the documentation.
Does A01.03 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. A01.03 mapped to HCC 115 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 115 (Pneumococcal Pneumonia/Empyema/Lung Abscess), ESRD (V21) category 115 (Pneumococcal Pneumonia/Empyema/Lung Abscess), and ESRD (V24) category 115 (Pneumococcal Pneumonia/Empyema/Lung Abscess).
