Modifier QY and QS

Hi,

I have received denial stating that the claim was billed with incompatible modifiers QY (directing 1 CRNA) and QS (Mac procedure done alone).Is there any guidelines that state a doctor cannot supervise a single crna, when he is providing monitored anesthesia care. Please provide your valuable feedback.

Thankyou,

Sheela, CPC

Modifier QY and QS