What is the job description of a hospital general medicine internist?

Hospitalist: Sounds like you're referring to a hospitalist. That's a general internal medicine doctor that specializes in caring for patients admitted to the hospital. It's one of the fastest growing fields of medicine. Hospitalists can and often do much more than patient care. Many have active roles in improving the quality of hospitals, administrative roles and very involved in education.

Hospitalist.: A Hospitalist is an Internal Medicine physician who concentrates solely on the acute management of the hospitalized patient.