Just hand this to the questioning doctor.
(1) WELLNESS AND PREVENTION PROGRAMS.A wellness and health promotion activity implemented under subsection (a)(1)(D) may not require the disclosure or collection of any information relating to
(A) the presence or storage of a lawfully-possessed firearm or ammunition in the residence or on the property of an individual; or
(B) the lawful use, possession, or storage of a firearm or ammunition by an individual.
(2) LIMITATION ON DATA COLLECTION.None of the authorities provided to the Secretary under the Patient Protection and Affordable Care Act or an amendment made by that Act shall be construed to authorize or may be used for the collection of any information relating to
(A) the lawful ownership or possession of a firearm or ammunition;
(B) the lawful use of a firearm or ammunition; or
(C) the lawful storage of a firearm or ammunition
You may verify this at: http://housedocs.house.gov/energycommerce/ppacacon.pdf and
http://wizbangblog.com/2013/01/10/obamacare-amendment-does-not-forbid-gun-and-ammo-registration/.;
Finally, someone with a legal answer.