H&P done by the PA on the day of surgery done at an ASC

Can anyone tell me what code is used when an H&P is done by the PA on the day of the surgery? The surgery is performed at an ASC. I am having problems in finding info on this. I want to make sure its coded right. Do we use a 9921x with the 57 modifier??? Please help. Thanks

H&P done by the PA on the day of surgery done at an ASC