Deirdre Yapalater’s recent colonoscopy at a surgical center near her home here on Long Island went smoothly: she was whisked from pre-op to an operating room where a gastroenterologist, assisted by an anesthesiologist and a nurse, performed the routine cancer screening procedure in less than an hour. The test, which found nothing worrisome, racked up what is likely her most expensive medical bill of the year: $6,385.
