Read the E-patient Dave Case in your text.

The case illustrates a patient, with worthy intent, transferring his personal health information from his "official" EHR to a more open platform with the objective of donating his private data for research purposes with startling results. He received a list of diagnoses, several of which are quite serious but with which he had never been diagnosed. The billing code parenthetical definition "rule out aortic aneurysm" gives a hint of the problem.

textbook: Health Informatics: Practical Guide (7th ed.) Hoyt, R. E., and Hersh, W. R. (2018)