or services at a medical facility of the Department. (b) Eligible veterans (1) A veteran is an eligible veteran for purposes of this section if the veteran is enrolled in the system of annual patient enrollment established and operated under section 1705 of this title and one or more of the following conditions apply: (A) The Secretary determines that it is in the clinical best interest of the veteran to access care or services outside of the Department. (B) The veteran would experience an undue burden if the veteran seeks care or services from the Department. (C) It is not economical for the Department to provide the veteran the care or services that the veteran needs. (2) A determination by the Secretary under paragraph (1)(A) shall include an assessment of factors relating to the medical or clinical condition of the veteran and the timeliness of the Department in providing the care or services required by the veteran. (3) For purposes of paragraph (1)(B), an undue burden— (A) means— (i) an excessive driving distance, geographical challenges, or environmental factors impede the access of the veteran to care or services from the Department