HIPPA for the most part places constraints on the custodians of records.
It is not particularly relevant if, as a condition for obtaining permission to purchase or possess a firearm, self disclosure is required and failure to do so is a crime. Just consider the questions on the ubiquitous Form 4473.
I recall that when I lived in Iowa, on the application for a CCW permit, you signed a release giving law enforcement carte blanche access to your medical records.
Paul
Last edited by Paul39; 07/26/15.