A 50-year-old man is admitted through the emergency department (ED) with a complaint of chest pain. The EKG and laboratory tests done in the ED are inconclusive, but an acute myocardial infarction is ruled out. During the hospital stay, the cardiovascular function studies could not disprove the existence of coronary artery disease. Results of a thallium cardiac stress test were mildly abnormal. The patient did not want to have a cardiac catheterization study performed. Gastrointestinal studies, including an EGD, found some abnormalities including evidence of gastroesophageal reflux disease. Given the conflicting information, the physician concludes the patient had “atypical chest pain due to either angina or GERD.” The patient is requested to visit both a cardiologist and gastroenterologist for additional testing. Principal Diagnosis:____________________________________________________________ Secondary Diagnosis: