; and (3) include a process for the enrollment of individuals made eligible for health care items and services under section 102(b). (b) Issuance of Medicare for All cards In conjunction with an individual’s enrollment for benefits under this Act, the Secretary shall provide for the issuance of a Medicare for All card that shall be used for purposes of identification and processing of claims for benefits under the Medicare for All Program. The card shall not include an individual’s Social Security number. 106. Effective date of benefits (a) In general Except as provided in subsection (b), benefits shall first be available under the Medicare for All Program for items and services furnished on January 1 of the fourth calendar year that begins after the date of enactment of this Act. (b) Immediate coverage of children (1) In general For any eligible individual under section 102 who has not yet attained the age of 19 as of the date that is 1 year after the date of enactment of this Act, benefits shall first be available under the Medicare for All Program for items and services furnished on January 1 of the first calendar year that begins after the date of enactment of this Act. (2) Option to continue in other coverage during transition period Any person who is eligible to receive benefits as described in paragraph (1) may opt to maintain any coverage described in section 901, private health insurance coverage, or coverage offered pursuant to subtitle A of title X (including the amendments made by such subtitle) until the date on which benefits are first available under subsection (a). 107. Prohibition against duplicating coverage (a) In general Beginning on the date on which benefits are first available under section 106(a), it shall be unlawful for— (1) a private health insurer to sell health insurance coverage that duplicates the benefits provided under the Medicare for All Program