B57.40
BillableChagas' disease with nervous system involvement, unspecified
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is B57.40 an HCC code?
No. B57.40 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
B57.40 is the ICD-10-CM diagnosis code for chagas' disease with nervous system involvement, unspecified. Chagas' disease affecting the nervous system when the specific type of nervous system involvement is not documented or specified. B57.40 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering protozoal diseases (b50-b64).
B57.40 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 only when documentation does not specify meningoencephalitis or other nervous system manifestations.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for B57.40 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when documentation does not specify meningoencephalitis or other nervous system manifestations
- •Review clinical notes to determine if a more specific B57.4x code applies