R.I. Gen. Laws § 27-20-48
Every individual or group hospital or medical expense insurance policy or individual or group hospital or medical services plan contract delivered, issued for delivery, or renewed in this state on or after January 1, 2004 shall provide coverage for diagnostic testing and long-term antibiotic treatment of chronic lyme disease when determined to be medically necessary and ordered by a physician acting in accordance with chapter 37.5 of title 5 entitled "lyme disease diagnosis and treatment" after making a thorough evaluation of the patient's symptoms, diagnostic test results and response to treatment. Treatment otherwise eligible for benefits pursuant to this section shall not be denied solely because such treatment may be characterized as unproven, experimental, or investigational in nature.
R.I. Gen. Laws § 27-20-48