the only time a doctor will have to let go of the information is if their files are subpoena'd for a court case or if they are called to testify in a trial.

in that case, you lose patient-doctor confidentiality--only client-lawyer confidentiality holds up. also if a doctor is transferring your care, he might include it in your medical records or mention it to your new doc, but most keep it as a very tiny note or just don't include it in the chart unless you have something like lung disease (btw debob, get a vape or start cooking some brownies).