§ 136a.15 Health Service Delivery Areas.
(a) The Indian Health Service will designate and publish as a notice in the Federal Register specific geographic areas within the United States including Federal Indian reservations and areas surrounding those reservations as Health Service Delivery Areas.
(b) The Indian Health Service may, after consultation with all the Indian tribes affected, redesignate the boundaries of any Health Service Delivery Area followed by publication of a notice in the Federal Register. Any redesignation of a Health Service Delivery area will include the reservation, and those areas close to the reservation boundaries which can reasonably be considered part of the reservation service area based on consideration of the following factors: