Good point - does the law allow for a "waiver" to be signed by the patient to get around this?
There is huge legal exposure in a group visit, and not just from privacy concerns. Can you imagine 10 patients talking at once?
Now imagine one of them comes down with a malignancy a year later, and claims he mentioned that nagging cough in the group setting but it must have gone unnoticed in the hubbub.
You think this is far-fetched? Not at all. Think like a trial lawyer. I manage physicians. They will do group visits over my dead body.