A friend who visited a hospital lab for a blood test was asked by the intake person how many employees he had, since he was listed as being self-employed. When he responded that it wasn't the lab's business, he was told that there was a new government regulation that required her to ask the question. He stated that he was there for a blood test ordered by his doctor, and that the number of people he employed had no bearing on that fact and furthermore concerned nobody but him, his employees and his accountant.
They ran the test. Whether they reported him for refusing to answer remains to be seen.