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Source: Centers for Medicare and Medicaid Services, Marketplace Open Enrollment Period Public Use Files. https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/Marketplace-Products/2018_Open_Enrollment.html

Notes: N/A signifies data was not reported. State breakdowns by age do not always sum to state totals.  Percentages are estimates based on available age data. In 2017 and 2018, the breakouts by age provided by CO and MN differ slightly from the states’ reported total number of plan selections due to data anomalies, and the breakouts by age provided by CA do not sum to the reported total number of plan selections because the state reports some individuals as ‘unknown.’ The breakouts reported by MA in 2018 do not sum to the state’s reported total due to cases where individuals experience birthdays that move them into a different age bracket in a future coverage month. ID reports plan selections in 2018 by different age breakouts than CMS was able to report.

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