There are other reasons for one issue one visit - it helps them avoid long sessions which inconvenience everyone else though as soon as insurance companies are

There are other reasons for one issue one visit - it helps them avoid long sessions which inconvenience everyone else though as soon as insurance companies are involved there are perverse incentives. Also there are different structures for payment, insurance and pay per visit are simply not necessary with single payer though some systems use an amalgam of public/private.