In this subchapter:
(1) "Legally responsible person" means a parent, guardian, or spouse, or any person whom the laws of this state hold responsible for debts incurred as a result of the hospitalization or treatment of a patient.
(2) "Local health authority" means a practicing physician who acts as:
(A) a municipal or county health authority;
(B) a director of a local health department or public health district; or
(C) a regional director of a public health region.
(3) "Physician" means a person licensed by the Texas Medical Board to practice medicine in this state.
(4) "Political subdivision" includes a county, municipality, or hospital district.
(5) "Public health hospital" means a hospital operated by the department to provide services under this subchapter, including the Texas Center for Infectious Disease.
(6) "Tuberculosis patient" means a person who has any form of tuberculosis in any part of the body.