Can I be billed an extra 15 min charge above the 30 min charge if my surgery lasted 34 mins?

I am being billed 30 mins plus an extra 15 min upcharge. When I inquired about this the billing department says that the surgery was a 34 min proceed

I am being billed 30 mins plus an extra 15 min upcharge. When I inquired about this the billing department says that the surgery was a 34 min proceedure and as such I can be be billed for the 30 plus 15. Is this legal for them to charge this?

or:I am being billed 30 mins plus an extra 15 min upcharge. When I inquired about this the billing department says that the surgery was a 34 min proceedure and as such I can be be billed for the 30 plus 15. Is this legal for them to charge this?

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