The average geographic adjustment factor is one of the main components of the Part C benchmark rates. A county AGA factor is calculated by taking the five-year average of geographic indices divided by a five-year enrollment weighted average risk score. This paper summarizes the potential impact to Part C benchmark rates due to the proposed CMS-HCC risk adjustment model released in the February 1, 2023, 2024 Advance Notice.

Proposed MA Risk Adjustment – Don’t Miss Out on the Nuanced Impacts to County Level Benchmark Rates
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