2027 ICD-10-CM Diagnosis Code A02.1Salmonella sepsis
ICD-10-CM Codes›A00–B99›A00-A09›A02
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 2
- Not Chronic
A02.1 is a billable ICD-10-CM diagnosis code for Salmonella sepsis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 870 through 872, 974 through 976. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 60 closely related codes. Coders also document this condition as bacteremia caused by Salmonella. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Septicemia.
For Medicare Advantage risk adjustment, A02.1 maps to CMS-HCC Category 2 (Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock) under the V28 model, adding a risk factor of about 0.500 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
A02.1 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
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.
- Bacteremia caused by Salmonella
- Recurrent salmonella sepsis co-occurrent with human immunodeficiency virus infection
- Sepsis caused by coliform bacteria
- Sepsis caused by Salmonella
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A02.1: 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 A02.1, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming A02.1: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 2
These codes carry an Excludes2 note naming A02.1: 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 A02.1 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.
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 A02.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A02.1Overview
What is the ICD-10 code for Salmonella sepsis?
The ICD-10-CM code for Salmonella sepsis is A02.1 (sometimes written as A021). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A02.1 (Other salmonella infections) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Salmonella sepsis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A02.1 group to?
When Salmonella sepsis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 974, 976, 872, 975, 871, 870, with relative weights from 0.7879 to 6.9432 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A02.1 a CC or MCC?
CMS lists A02.1 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 60 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A02.1?
Under the General Equivalence Mappings, Salmonella sepsis converts to ICD-9-CM 003.1 (Salmonella septicemia) and 995.91 (sepsis). The mapping is approximate, so confirm the match fits the documentation.
What HCC is A02.1?
A02.1 (Salmonella sepsis) maps to CMS-HCC Category 2 (Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock), commonly written as HCC 2, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 2 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does A02.1 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, A02.1 adds a risk adjustment factor of about 0.500 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.447 to 0.780 depending on the payment segment). HCC 2 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 2 category page.
