The Immortal Doctor is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Tang Qian, a college student, bumped his head into a red hearth while helping an owner in an antique shop. Since then, he has a strange ability. There is always an old man in his brain talking, and whenever he sees a patient, he will say the illness and the prescription brought people back to life.