Medicare consists of several parts: Part A is Hospital Insurance, Part B is Supplementary Medical Insurance, and Part D is Prescription Drug Insurance.

If you enroll in Medicare Part A, you are automatically enrolled in Medicare Part B. Generally, there is no premium associated with Medicare Part A. However, a monthly premium is required for Medicare Part B coverage.. You should contact your local Social Security office for information about Medicare when you are approaching your 65^th birthday, if you are considering retiring.

Note: If you are enrolled in Medicare Part A or B, you are not eligible for an HSA. However, if you previously had an HSA and have a remaining balance, you may use the funds to pay for eligible expenses even if you receive Medicare benefits. Neither you or Citi are permitted to contribute to your HSA after you enroll in Medicare.

If you are Medicare eligible, but do not enroll, you are permitted to have an HSA and may continue to contribute until the month after you enroll in Medicare.

Medicare Part D provides prescription drug benefits and requires you to pay a separate monthly premium. As a participant in a Citi medical plan, you do not need to enroll for Medicare Part D coverage because the Citi prescription drug coverage is expected to pay out as much as the standard Medicare prescription drug coverage benefits ("creditable coverage"). As long as you have creditable coverage through the Citi medical plan, you will have a special enrollment period in which to enroll in Medicare Part D prescription drug coverage after your Citi prescription drug coverage ceases without penalty. Annually, you receive a "Notice of Creditable Coverage" from Citi which describes this process.