Physical Therapy Eval billing

We are new at Physical Therapy and billing has been a big problem. We are getting denials from Medicare for CPT 97162,97163 and 97164 ( billed with Modifier GP). Medicare Denial reason N572-“This procedure is not payable unless appropriate non-payable reporting codes and associated modifiers are submitted.”

These evaluation codes are billed with 97110 or 97112.

Is there other codes that need to be billed with the evaluation codes?

Help Please!!!