2027 ICD-10-CM Diagnosis Code A02.9Salmonella infection, unspecified
ICD-10-CM Codes›A00–B99›A00-A09›A02
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A02.9 is a billable ICD-10-CM diagnosis code for Salmonella infection, unspecified. 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, 974 through 976. 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 1 closely related codes. Coders also document this condition as infection caused by Salmonella co-occurrent with human immunodeficiency virus infection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Intestinal infection.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Infection caused by Salmonella co-occurrent with human immunodeficiency virus infection
- Salmonella Ebrie or Salmonella Monschaui
- Salmonella food poisoning
- Salmonella infection
- Salmonella infection with AIDS
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A02.9: its own notes plus those printed at A02 and 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.
- infection or foodborne intoxication due to any Salmonella species other than S. typhi and S. paratyphi
- 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 A02.9, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming A02.9: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 2
These codes carry an Excludes2 note naming A02.9: 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 A02.9 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.
Poisoning (acute) See Also: Table of Drugs and Chemicals;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Salmonella Infections
infections with bacteria of the genus salmonella.
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 A02.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A02.9Overview
What is the ICD-10 code for Salmonella infection, unspecified?
The ICD-10-CM code for Salmonella infection, unspecified is A02.9 (sometimes written as A029). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A02.9 (Other salmonella infections) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Salmonella infection, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A02.9 group to?
When Salmonella infection, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 974, 976, 975, 867, 869, 868, with relative weights from 0.6784 to 3.0488 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A02.9 a CC or MCC?
CMS lists A02.9 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 1 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A02.9?
Under the General Equivalence Mappings, Salmonella infection, unspecified converts to ICD-9-CM 003.9 (Salmonella infection NOS). The mapping is a direct match.
