2026 ICD-10-CM Diagnosis Code A02.22Salmonella pneumonia
ICD-10-CM Codes›A00–B99›A00-A09›A02
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Not Chronic
A02.22 is a billable ICD-10-CM diagnosis code for Salmonella pneumonia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 177 through 179, 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 118 closely related codes. Coders also document this condition as localized Salmonella infection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Pneumonia (except that caused by tuberculosis).
A02.22 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 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
A02.22 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 2026 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.
- Localized Salmonella infection
- Salmonella pneumonia
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.
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 A02.22 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A02.22Overview
What is the ICD-10 code for Salmonella pneumonia?
The ICD-10-CM code for Salmonella pneumonia is A02.22 (sometimes written as A0222). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is A02.22 (Localized salmonella infections) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Salmonella pneumonia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A02.22 group to?
When Salmonella pneumonia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 177, 178, 179, 974, 975, 976, with relative weights from 0.7550 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A02.22 a CC or MCC?
CMS lists A02.22 as an MCC (major complication or comorbidity) for FY 2026. 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 118 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A02.22?
Under the General Equivalence Mappings, Salmonella pneumonia converts to ICD-9-CM 003.22 (Salmonella pneumonia). The mapping is a direct match.
Does A02.22 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. A02.22 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).
