R.I. Gen. Laws § 27-20.1-20
Every entity providing a nonprofit dental service plan as defined in this chapter shall notify all dentists providing services under a group or individual policy, contract or health benefit plan for coverage of dental services, in writing, of any changes to its rules and regulations, guidelines, policies or procedures concerning coverage of or payment for dental services. Said notice of changes in terms shall be communicated to the participating dentists by the dental plan in electronic mail format or, in addition, beginning January 1, 2012, and upon the written request of the dentist, received by the nonprofit dental service plan on or before December 31, 2011, by U.S. mail, showing the changes in redline format and shall be provided to the participating dentists no later than fifteen (15) days before the effective date of said changes.
R.I. Gen. Laws § 27-20.1-20