Across plans and states, the expansion population experienced high disenrollment rates, indicating that, as in other Medicaid eligibility groups, there is substantial churn in this population.

• Even after adjusting for age and gender, claims costs increased steadily over time, suggesting that expansion enrollees have complex and/or chronic conditions.
— For some enrollment cohorts, average claims costs decreased modestly in the second half of the first year of enrollment, suggesting some initial pent-up demand for services, though claims costs increased steadily from that point forward.
• Across enrollment groups, per member per month spending on prescription drugs increased with enrollment duration.
— Among enrollees who remained enrolled the longest, inpatient claims initially made up the largest share of claims costs, but were surpassed by prescription drug claims by month 8 of enrollment, on average.

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