This link leads to the machine-readable files that are made available in response to the federal Transparence in Coverage Rule and includes negotiated service rates and out-of-network allowed amounts between health plans and healthcare providers. The machine readable files are formatted to allow researchers, regulators, and a application developers to more eaily access and analyze data.
Harvard Pilgrim Healthcare | Machine Readable File
https://www.harvardpilgrim.org/public/machine-readable-files