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If I buy or re-enroll in a health plan during the Health Insurance Marketplace open enrollment period, when will my coverage start?

If I buy or re-enroll in a health plan during the Health Insurance Marketplace open enrollment period, when will my coverage start?

The Health Insurance Marketplace open enrollment period for 2018 health coverage is November 1, 2017 through December 15, 2017. If you are enrolled in a marketplace health insurance plan, your coverage ends December 31, 2017. To continue health coverage in 2018, you can renew or choose a new plan during the marketplace open enrollment period. You must enroll by the December 15 deadline to ensure you will have coverage that starts January 1, 2018.