Victoria Elizabeth Fischer was presented with a white coat by her grandfather, Dr. Christian Van Den Heuvel, at Georgetown University School of Medicine in August. The ceremony marks the start for each new class of medical students. Lisa Helfert/Courtesy of Georgetown University hide caption

itoggle caption Lisa Helfert/Courtesy of Georgetown University

People wait to enter an Affordable Care Act enrollment event sponsored by SEIU-United Healthcare Workers West and Community Coalition in Los Angeles. Healthcare.gov's second enrollment period opened Saturday. More 100,000 people applied in the first day. Michael Chavez/AP hide caption

itoggle caption Michael Chavez/AP

Health workers in protective suits transport Dr. Martin Salia, a surgeon working in Sierra Leone who has been diagnosed with Ebola, from a jet that brought him from Sierra Leone to a waiting ambulance in Omaha, Neb., on Saturday. Nati Harnik/AP hide caption

itoggle caption Nati Harnik/AP

Insurance companies negotiate with hospitals and doctors the price of every treatment, procedure and medical service. That price differs from hospital to hospital — even health plan to health plan. Vincent Wartner/Science Source hide caption

itoggle caption Vincent Wartner/Science Source

The second open enrollment period for buying health insurance under the federal Affordable Care Act starts Saturday. Don Ryan/AP hide caption

itoggle caption Don Ryan/AP

A nurse adjusts the position of a patient's arm during dialysis treatment. The treatment requires trained staff that weren't readily available in the aftermath of Hurricane Sandy. Michael Donne/Science Source hide caption

itoggle caption Michael Donne/Science Source

Ouch! Jeffrey Craig Hopper got good emergency treatment after being hit in the eye with a baseball in June. But months later he was slapped with an extra medical bill he never expected. Jennifer Hopper hide caption

itoggle caption Jennifer Hopper