The “Rxisk” of adjustments in 2018 ACA risk adjustment

The Centers for Medicare and Medicaid Services (CMS) is adding a new prescription drug category classification system to the 2018 risk adjustment model. Starting in 2018, a condition will be identified through a Hierarchical Condition Category with associated medical diagnosis codes, a prescribed medication, or both—each one affecting the final risk member score differently. This paper by Milliman consultants approximates the likely CMS mapping based on the publicly available information to date.