To meet this requirement, for our Aetna plans, MRFs will be posted monthly on Health1.Aetna.com. This location is publicly available and accessible to all, and no authentication is required. To link to the Machine Readable Files, please click on the URL above. Monthly MRFS will appear on this site. While these files are accessible to all, the file itself is large, written in JSON, which is a machine readable language, and not easily interpreted or searchable.