Local coverage determination (LCD) policies issued by Medicare administrative contractors (MACs) serve as the workhorse of Medicare coverage policy. About 90 percent of coverage determinations are made through LCDs. This content is an exclusive benefit for American Academy of Audiology members. If you're a member, log in and you'll get immediate access. Member Login If you're not yet a member, you'll be interested to know that joining not only gives you access to top-notch resources like this one, but also invitations to member-only events, inclusion in the member directory, participation in professional forums, and access to patient resources, tools, and continuing education. Join today!