Specifications include, but are not limited to: Harris Health System requires vendor(s) to provide ambulance services based on various service classifications: Service between primary, secondary and Texas Medical Center (TMC) sites, 24 hours/day, seven days/week. Services will be provided for persons in the following patient conditions (all service categories): ambulatory; stretcher; bariatric stretcher; wheelchair; infant (carried); infant (transport unit); and cadaver. Backup service between Harris Health System primary sites and the Medical Center, Monday through Friday between 6:00 a.m. and 11:00 p.m. Service, as needed, between primary sites and other sites, 24 hours/day, seven days/week. Vendor must bill third party payor or private insurance after verification of eligibility by Harris Health System Emergency Medical Service (EMS) Manager. Emergency transfer service between the three (3) primary sites, 24 hours/day, seven days/week.