; or (ii) if the date on which the Postal Service employee becomes a Postal Service annuitant falls outside of an open season, the first open season following that date; and (D) subparagraphs (A), (B), and (C) shall not apply to an employee who resides in a geographic area for which there is not a PSHBP plan in which the employee may enroll. (e) Requirement of Medicare enrollment (1) Postal Service Medicare eligible annuitants A Postal Service Medicare eligible annuitant subject to this section may not continue coverage under the Postal Service Health Benefits Program unless the Postal Service Medicare eligible annuitant enrolls in Medicare part A, Medicare part B, and Medicare part D (as part of a prescription drug plan described in subsection (f)(2)). (2) Medicare eligible family members If a family member of a Postal Service annuitant who is subject to this section is a Medicare eligible individual, the family member may not be covered under the Postal Service Health Benefits Program as a family member of the Postal Service annuitant unless the family member enrolls in Medicare part A, Medicare part B, and Medicare part D (as part of a prescription drug plan described in subsection (f)(2)). (3) Process for coordinated election of enrollment under Medicare part B The Office shall establish a process under which— (A) Postal Service annuitants and family members who are subject to the requirements of paragraph (1) or (2)— (i) are informed, at the time of enrollment under this chapter, of such requirement; and (ii) except as provided in paragraph (4), as a consequence of such enrollment are deemed to have elected to be enrolled under Medicare part B (under subsection (m)(1) of section 1837 of the Social Security Act ( 42 U.S.C. 1395p )) in connection with the enrollment in a PSHBP plan under this chapter