RI Gen L § 27-18.9-6(a)(3)

(3) For pre-service claims (adverse or non-adverse), within a reasonable period of time appropriate to the medical circumstances, but not later than fifteen (15) calendar days after the receipt of the claim. This may be extended up to fifteen (15) additional calendar days if required by special circumstances and claimant is noticed within the first fifteen (15) calendar-day period.