R.I. Gen. Laws § 19-14.8-24: Voluntary contributions.

A provider may not solicit a voluntary contribution from an individual or an affiliate of the individual for any service provided to the individual. A provider may accept voluntary contributions from an individual but, until thirty (30) days after completion or termination of a plan, the aggregate amount of money received from, or on behalf of, the individual may not exceed the total amount the provider may charge the individual under § 19-14.8-23.