Another thing to consider about deanonymization: HIPAA says that 4 or more digits of a zipcode is PII. The people who protect your healthcare think most of a z

Another thing to consider about deanonymization: HIPAA says that 4 or more digits of a zipcode is PII. The people who protect your healthcare think most of a zipcode is too cardinal to reveal. How many schools serve more than one zipcode? More than a few?