About Lonestar 24 HR ER Lonestar 24 HR ER is comprised of 10 board certified Physicians who are experts in emergency medicine. Our physicians have extensive backgrounds in running and directing various emergency departments in hospitals around the country. Our facility is equipped to handle a wide range of medical emergencies. Lonestar 24 HR ER offers each patient personalized emergency room care with less of the wait that one would find at hospital ERs. Come to our facility and take advantage of our in-house lab testing and friendly bilingual staff. We offer patient advocates to help deal with your insurance company and work with you through every aspect of the billing process.