You will be able to remain in the CDHP for the plan year, but will no longer be allowed to make contributions to or receive employer contributions in your HSA. You may continue to use the existing funds in your account to pay for qualified medical expenses. You will not be eligible to continue in the CDHP plan for the following year. In addition, see question and answer #21, which means that if you enroll in Medicare mid-year, you also would not be able to contribute up to the full IRS maximum into your HSA.
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