; and (ii) in consultation with and upon approval of the veteran, make such assignment if able. (2) (A) (i) Except as provided in clause (ii), the Secretary may only furnish specialty hospital care, medical services, or extended care services to an eligible veteran under this section pursuant to a referral for such specialty care or services made by the primary care provider of the veteran. (ii) The Secretary may designate specialties which shall be exempt from the requirement under clause (i). (B) The Secretary shall determine whether to furnish specialty hospital care, medical services, or extended care services to an eligible veteran pursuant to subparagraph (A)— (i) at a medical facility of the Department that is within a reasonable distance of the residence of the veteran, as determined by the Secretary; (ii) by a network provider that, to the greatest extent practicable, is located in the regional network in which the veteran resides or a regional network that is adjacent to the regional network in which the veteran resides; or (iii) pursuant to an agreement described in subparagraph (C). (C) An agreement described in this subparagraph is an agreement entered into by the Secretary with a network provider under which— (i) specialty hospital care, medical services, or extended care services are furnished to an eligible veteran pursuant to subparagraph (A)— (I) at a medical facility of the Department by a network provider possessing the appropriate credentials, as determined by the Secretary; or (II) at a facility of a network provider by a health care provider of the Department; and (ii) such specialty care or services are so furnished either— (I) in accordance with this section with respect to fees and payments for care and services furnished under subsection (a)