If you're referring to what the providers use for patient documentation, billing etc, there's a slew of apps out there that unfortunately don't talk to each other in much of a meaningful way without a lot of work. Beyond the big EMR companies (Epic, Cerner, Allscripts, Siemens, etc -- what you'll see at academic centers and medium-large hospitals), there are tons of companies that have come out with medical record software for individual clinics (i.e. a couple dicots in a practice not owned by or affiliated with a major medical center) and much of it is often marketed in a niche way