Or. Rev. Stat. § 743B.452
(1) An insurer that fails to pay a claim to a provider within the timelines established in ORS 743B.450 shall pay simple interest of 12 percent per annum on the unpaid amount of the claim that is due and owing, accruing from the date after the payment was due until the claim is paid. Interest on any overdue payment for a claim begins to accrue on the 31st day after:
[Formerly 743.913]