Better Call Saul
Barry meets with Mike after receiving a call in advance from Gus Fring. He supplies Mike with cocaine. ("Sunk Costs")
Dr. Barry Goodman and his team treat Gus for poisoning and Mike Ehrmantraut for gunshot wounds after they led an attack on Don Eladio Vuente and the Juárez Cartel. He initially ignores Mike and goes straight to helping Gus, because Gus "pays his salary". It is known that he has blood samples and knows the complete medical history of Gus, Mike, Jesse Pinkman, and most likely others ("Crawl Space").