As part of the Transparency in Coverage Final Rule set forth by the U.S. Department of the Treasury, the U.S. Department of Labor, and the U.S. Department of Health and Human Services (referred to collectively as the “Tri-Agencies”), group health plans and health insurance issuers are required to make available to the public negotiated rates for all covered items with in-network providers, and historical payments to and billed charges from, out-of-network providers through machine-readable files (MRFs) posted on an internet website, updated monthly. These files will permit the public to have access to health plan payment information that can be used to understand health plan pricing and the cost for health care services.
See this link for more information: https://www.harvardpilgrim.org/public/machine-readable-files