2027 ICD-10-CM Diagnosis Code A02.0Salmonella enteritis

ICD-10-CM Codes›A00–B99›A00-A09›A02

ICD-10-CM A02.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A02.0 is a billable ICD-10-CM diagnosis code for Salmonella enteritis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 371 through 373. 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 79 closely related codes. Coders also document this condition as infection of gastrointestinal tract by Salmonella enterica arizonae. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Intestinal infection.

Code Identity

ICD-10-CM Code
A02.0
Billable Status
Yes — Valid for Submission
Code Describes
Salmonella enteritis
Short Description
Salmonella enteritis
Same as the full description in the CMS dataset.
Parent Code
A02
Other salmonella infections

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA02Other salmonella infections
This CodeA02.0Salmonella enteritis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Infection of gastrointestinal tract by Salmonella enterica arizonae
  • Infection of intestine caused by Salmonella group A
  • Infection of intestine caused by Salmonella group C
  • Infection of intestine caused by Salmonella group D
  • Infection of intestine caused by Salmonella group E
  • Infection of intestine caused by Salmonella group O:4
  • Intestinal infection caused by Arizona group
  • Salmonella enterica arizonae infection
  • Salmonella gastroenteritis
  • Salmonellosis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A02.0: 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.

From A02 Other salmonella infections applies to 11 codes
  • infection or foodborne intoxication due to any Salmonella species other than S. typhi and S. paratyphi
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Salmonellosis

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.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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 A02.0, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming A02.0: they are not reported together with it, unless the two conditions are unrelated.

  • A05 Other bacterial foodborne intoxications, not elsewhere classified
    salmonella foodborne intoxication and infection (A02.-) names A02.-, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming A02.0: 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
    intestinal infectious disease (A00-A09) names A00-A09, which includes this code
  • P37 Other congenital infectious and parasitic diseases
    infectious neonatal diarrhea (A00-A09) names A00-A09, which includes this code

Code First 1

These codes say to code first a condition named in the note, and A02.0 is one of the conditions named.

  • M49 Spondylopathies in diseases classified elsewhere
    enterobacterial infections (A01-A04) names A01-A04, which includes this code

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.

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG001
Intestinal infection
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Salmonella Infections

    infections with bacteria of the genus salmonella.

Patient EducationClinical

Gastroenteritis

Gastroenteritis is an inflammation of the lining of the stomach and intestines. The main symptoms include vomiting and diarrhea. It is usually not serious in healthy people, but it can sometimes lead to dehydration or cause severe symptoms.

The full article covers:

  • What is gastroenteritis?
  • What causes gastroenteritis?
  • What are the symptoms of gastroenteritis?
  • How is gastroenteritis diagnosed?
  • What are the treatments for gastroenteritis?
  • Can gastroenteritis be prevented?

Read the full article at MedlinePlus

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

Convert A02.0 to ICD-9-CMHistory

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

ICD-9-CM
003.0 Salmonella enteritis
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A02.0Overview

What is the ICD-10 code for Salmonella enteritis?

The ICD-10-CM code for Salmonella enteritis is A02.0 (sometimes written as A020). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A02.0 (Other salmonella infections) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report Salmonella enteritis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does A02.0 group to?

When Salmonella enteritis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 372, 371, 373, with relative weights from 0.6945 to 1.7087 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A02.0 a CC or MCC?

CMS lists A02.0 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 79 closely related codes in its exclusion list.

What is the ICD-9 equivalent of A02.0?

Under the General Equivalence Mappings, Salmonella enteritis converts to ICD-9-CM 003.0 (Salmonella enteritis). The mapping is a direct match.