under Medicare Part B, all of the following statements are true and are applicable to nonparticipating physician provide

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under Medicare Part B, all of the following statements are true and are applicable to nonparticipating physician providers, EXCEPT

A. providers must file all Medicare claims.
B. nonparticipating providers have a higher fee schedule than that for participating providers.
C. fees are restricted to charging no more than the "limiting charge" on nonassigned claims.
D. collections are restricted to only the deductible and coinsurance due at the time of service on an assigned claim.