Question 1

What is ICD-10 code B54?

Accepted Answer

B54 is the ICD-10-CM diagnosis code for unspecified malaria. Malaria infection where the specific type of parasite causing the disease has not been identified or confirmed. B54 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering protozoal diseases (b50-b64).

B54 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.

This is a default code used when malaria is clinically suspected or diagnosed but organism type is unknown.

Question 2

Is B54 an HCC code?

Accepted Answer

No. B54 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 B54 billable?

Accepted Answer

Yes. B54 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. B54 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 B54?

Accepted Answer

B54 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 B54 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 B54?

Accepted Answer

This is a default code used when malaria is clinically suspected or diagnosed but organism type is unknown Attempt to identify the specific plasmodium species through testing; update coding once organism is confirmed

B54

Is B54 an HCC code?

What This Code Means

Coding Tips

Code Hierarchy

Open B54 in the Interactive Encoder