RI Gen L § 27-41-64(d)

(d) A health care entity or health plan which fails to reimburse the health care provider or policyholder after receipt by the health care entity or health plan of a complete claim within the required timeframes shall pay to the health care provider or the policyholder who submitted the claim, in addition to any reimbursement for health care services provided, interest which shall accrue at the rate of twelve percent (12%) per annum commencing on the thirty-first (31st) day after receipt of a complete electronic claim or on the forty-first (41st) day after receipt of a complete written claim, and ending on the date the payment is issued to the health care provider or the policyholder.