You might assume that what you tell a doctor stays between you, your physician and perhaps your insurer. But the reality is more complicated.
The Health Insurance Portability and Accountability Act, the federal privacy law that governs health information and is commonly known as HIPAA, is narrower than its reputation suggests. It regulates hospitals, physicians, insurers and their business associates, but not the health data you generate everywhere else: not the period-tracking application on your phone, the internet search you ran about a diagnosis, the DNA you mailed to a genealogy company or the wearable that counts your heartbeats.
