Question 1

What is ICD-10 code Z22.340?

Accepted Answer

Z22.340 is the ICD-10-CM diagnosis code for carrier of carbapenem-resistant acinetobacter baumannii. A person who carries carbapenem-resistant Acinetobacter baumannii bacteria without being sick, but can potentially spread it to others. Z22.340 sits in the ICD-10-CM chapter for factors influencing health status and contact with health services (z00-z99), within the section covering persons with potential health hazards related to communicable diseases (z20-z29).

Z22.340 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Use this code when culture or testing confirms carbapenem resistance in the Acinetobacter baumannii strain.

Question 2

Is Z22.340 an HCC code?

Accepted Answer

No. Z22.340 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is Z22.340 billable?

Accepted Answer

Yes. Z22.340 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. Z22.340 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.

Question 4

What is the V28 vs V24 difference for Z22.340?

Accepted Answer

Z22.340 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards Z22.340 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting Z22.340?

Accepted Answer

Use this code when culture or testing confirms carbapenem resistance in the Acinetobacter baumannii strain This is a carrier status code, not a diagnosis of active infection; the patient may be asymptomatic

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Z22.340

Is Z22.340 an HCC code?

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Z22.340 ICD-10-CM Code: Carrier of carbapenem-resistant Acinetobacter baumannii

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Z22.340

Is Z22.340 an HCC code?

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Open Z22.340 in the Interactive Encoder