An Indian nation that occupies a reservation the external boundaries of which border more than four counties may form a health district or public health department as provided in this chapter. A tribal public health unit and bordering public health units shall collaborate regarding the provision of public health services. If an individual who is not an enrolled member of an     Indian tribe of the Indian reservation that forms a tribal public health unit is a party to a civil action in which the tribal public health unit is also a party, that individual may bring the action in or move the action to tribal court or district court.