; (2) provide for the enrollment, as of the date described in section 106, of all individuals who are eligible to be enrolled as of such date; and (3) include a process for the enrollment of individuals made eligible for health care services under section 102(b). (b) Issuance of Universal Medicare cards In conjunction with an individual’s enrollment for benefits under this Act, the Secretary shall provide for the issuance of a Universal Medicare card that shall be used for purposes of identification and processing of claims for benefits under this 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 this Act for items and services furnished on January 1 of the fourth calendar year that begins after the date of enactment of this Act. (b) Coverage for children (1) In general For any eligible individual who has not yet attained the age of 19, benefits shall first be available under this Act 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 effective date described in subsection (a). 107. Prohibition against duplicating coverage (a) In general Beginning on the effective date described in section 106(a), it shall be unlawful for— (1) a private health insurer to sell health insurance coverage that duplicates the benefits provided under this Act