Quote Quoting Mercy&Grace
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Even with a treating physician you sign an agreement giving the dr permission to release your medical info to other healthcare professionals that the dr may consult and your insurance company and others. Very, very few people read every paper completely before signing it. Then they say they never gave permisssion. These papers are signed when you do the New Patient paperwork.
Yep. I'm sure the OP signed something like that.

I'm a veteran of many an employer physical. Had two already this year- Coast Guard merchant marine renewal and the federal agency I work for. And lots of drug tests. And they can indeed share info with one another.