Internal medicine is the practice of preventing, diagnosing, and treating adult disease. It is a broad medical specialty comprised of subspecialties such as cardiology, pulmonology, nephrology, and gastroenterology. Internal medicine physicians manage patients in both the inpatient and outpatient settings. Hospitalists are a subset of internal medicine physicians who manage acute care of patients within the hospital only. Patients who undergo and successfully recover from neurosurgical intervention may require ongoing care from internal medicine physicians for comorbid diseases.