What is ICD-10 code A02.22?

A02.22 is the ICD-10-CM diagnosis code for Salmonella pneumonia. A bacterial lung infection caused by Salmonella bacteria, which typically enters the body through contaminated food or water. This condition causes inflammation of the lungs and can result in cough, fever, and difficulty breathing. A02.22 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. A02.22 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. A02.22 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. A02.22 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for A02.22?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. A02.22 was a payment HCC under V24 (Pneumococcal Pneumonia, Empyema, Lung Abscess) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting A02.22?

Verify documentation confirms both Salmonella infection AND pneumonia (lung involvement) before assigning this code; pneumonia must be explicitly stated or clearly documented Do not use this code for Salmonella gastroenteritis or other Salmonella infections without respiratory involvement; ensure the infection site is specifically the lungs Because A02.22 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

2026 ICD-10-CM A02.22: Salmonella pneumonia

ICD-10-CM Code View

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Code lookupA02.22Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Intestinal infectious diseases (A00-A09)

A02.22

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Salmonella pneumonia

A bacterial lung infection caused by Salmonella bacteria, which typically enters the body through contaminated food or water. This condition causes inflammation of the lungs and can result in cough, fever, and difficulty breathing.

Buddy Insight

Salmonella pneumonia is a rare but serious pulmonary infection caused by non-typhi Salmonella species, typically occurring in immunocompromised patients.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Mapped

HCC 115

Pneumococcal Pneumonia, Empye...

RAF 0.130

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

Mapped

HCC 115

Pneumococcal Pneumonia, Empye...

RAF 0.030

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

A02Other salmonella infections

A02.2Localized salmonella infections

A02.22Salmonella pneumonia

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for A02.22 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for A02.22 in this effective period.

Related Child Codes

Official

A02.20Localized salmonella infection, unspecified

A02.21Salmonella meningitis

A02.23Salmonella arthritis

A02.24Salmonella osteomyelitis

A02.25Salmonella pyelonephritis

Includes

Official

ICD-10-CM does not list Includes notes for A02.22 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for A02.22 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for A02.22 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for A02.22 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for A02.22 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Respiratory culture or blood culture identifying Salmonella species with pulmonary involvement

Chest imaging confirming pneumonic infiltrates or consolidation

Clinical documentation explicitly linking the pneumonia to Salmonella infection

Immunocompromised status if present (HIV, transplant, chemotherapy)

MEAT Support

HCC Buddy guidance

Respiratory culture or blood culture identifying Salmonella species with pulmonary involvement

Chest imaging confirming pneumonic infiltrates or consolidation

Clinical documentation explicitly linking the pneumonia to Salmonella infection

Immunocompromised status if present (HIV, transplant, chemotherapy)

Audit Caution

HCC Buddy guidance

Do not assign A02.22 for pneumonia that incidentally occurs in a patient with Salmonella gastroenteritis — the pneumonia must be caused by Salmonella

This is a combination code — do not add a separate J15-J18 pneumonia code for the same episode

Distinguish from aspiration pneumonia in a patient with Salmonella gastroenteritis, which would be coded as J69.0 instead

Common Mistakes

HCC Buddy guidance

A01.03 (Typhoid pneumonia) — Use A01.03 for S. typhi pneumonia specifically; A02.22 is for all other Salmonella species

J15.9 (Unspecified bacterial pneumonia) — Use A02.22 when Salmonella is the documented cause, not a generic pneumonia code

A02.1 (Salmonella sepsis) — If the patient has both sepsis and pneumonia from Salmonella, code both A02.1 and A02.22

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is A02.22 an HCC code?

Yes. A02.22 maps to Pneumococcal Pneumonia, Empyema, Lung Abscess under the V24 model but is not retained in V28.

Code: A02.22
Description: Salmonella pneumonia
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

V24HCC 115, Pneumococcal Pneumonia, Empyema, Lung Abscess

0.130

ESRDHCC 115, Pneumococcal Pneumonia, Empyema, Lung Abscess

0.030

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work A02.22 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for A02.22

For A02.22 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed A02.22 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

A02.22 is the ICD-10-CM diagnosis code for salmonella pneumonia. A bacterial lung infection caused by Salmonella bacteria, which typically enters the body through contaminated food or water. This condition causes inflammation of the lungs and can result in cough, fever, and difficulty breathing. A02.22 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering intestinal infectious diseases (a00-a09).

Under the older CMS-HCC V24 model, A02.22 maps to Pneumococcal Pneumonia, Empyema, Lung Abscess (HCC 115) with a community, non-dual, aged base RAF weight of 0.130. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Verify documentation confirms both Salmonella infection AND pneumonia (lung involvement) before assigning this code; pneumonia must be explicitly stated or clearly documented. Because A02.22 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A02.22 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify documentation confirms both Salmonella infection AND pneumonia (lung involvement) before assigning this code; pneumonia must be explicitly stated or clearly documented
•Do not use this code for Salmonella gastroenteritis or other Salmonella infections without respiratory involvement; ensure the infection site is specifically the lungs

Clinical Significance

Salmonella pneumonia is a rare but serious pulmonary infection caused by non-typhi Salmonella species, typically occurring in immunocompromised patients. It indicates systemic salmonellosis with lung involvement and requires targeted antibiotic therapy beyond standard pneumonia treatment protocols.

Documentation Requirements

✓Respiratory culture or blood culture identifying Salmonella species with pulmonary involvement
✓Chest imaging confirming pneumonic infiltrates or consolidation
✓Clinical documentation explicitly linking the pneumonia to Salmonella infection
✓Immunocompromised status if present (HIV, transplant, chemotherapy)
✓Differentiation from other concurrent pneumonia etiologies

Commonly Confused Codes

•A01.03 (Typhoid pneumonia): Use A01.03 for S. typhi pneumonia specifically; A02.22 is for all other Salmonella species
•J15.9 (Unspecified bacterial pneumonia): Use A02.22 when Salmonella is the documented cause, not a generic pneumonia code
•A02.1 (Salmonella sepsis): If the patient has both sepsis and pneumonia from Salmonella, code both A02.1 and A02.22