Medicare Managed Care Manual (Pub. 100-16), Ch. 16a § 90.1
General Requirements
90.1 – General Requirements
(Rev. 99, Issued: 05-27-11, Effective: 05-27-11, Implementation: 05-27-11)
PFFS plans are prohibited from restricting a members’ access to services by requiring
prior authorization, prior notification, or referrals as a condition of coverage when
medically necessary, plan-covered services are furnished to members. However,
members and providers have the right to request a written advance organization
determination from the plan, in accordance with Subpart M of Part 422, before a member
receives a service in order to confirm that the service is medically necessary and will be
covered by the plan. Refer to section 100 of this chapter for information on advance
organization determinations. The requirements described below apply to all three types
(full, partial, and non-network) of PFFS plans.