Formally called the Office of the Attending Physician, the clinic — and at least six satellite offices it supports — bills its mission as one of emergency preparedness and public health. Each day, it stands ready to handle medical emergencies, biological attacks and the occasional fainting tourist visiting Capitol Hill.

Officially, the office acknowledges these types of services, including providing physicals to Capitol police officers and offering flu shots to congressional staffers. But what is rarely discussed outside the halls of Congress is the office’s other role — providing a wealth of primary care medical services to senators, representatives and Supreme Court justices.

Through interviews with former employees and members of Congress, as well as extensive document searches, ABC News has learned new details about the services offered by the Office of Attending Physician to members of Congress over the past few years, from regular visits by a consulting chiropractor to on-site physical therapy…

The OAP refused to comment in detail for this story, and Rear Adm. Brian Monahan, the Attending Physician to Congress, did not return phone calls requesting an interview. When ABC News chief medical editor Dr. Timothy Johnson visited the office in person in September to speak with Monahan, he was asked to leave.