Healthcare.gov website says:

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  Say no to scams
  Don’t share your personal information or give money to anyone saying you have to pay      them to keep Medicaid or CHIP coverage or apply for Marketplace coverage. The                  Marketplace, assister organizations, and your state will never threaten you or anyone in      your household or ask for your credit card information or payment to keep or qualify for    health coverage.

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  Report it if someone calls, emails, or texts you asking for:

•  Your personal information (like your Social Security Number)

•  Money (like credit card payment, gift cards, cash, prepaid debit card, or     cryptocurrency)

•  Or, if they threaten you or anyone in your household with legal action