Which of the Following Is Not a Restriction Typically Placed

Which of the following is not a restriction typically placed on non-PAR providers?

A) fees are restricted to no more than the limiting charge
B) lab fees are paid as accept assignment only at the allowed fee schedule regardless of the providers status as PAR or non-PAR
C) only the deductible and/or coinsurance can be collected at the time of service
D) claims must be filed by the patient