Medicare Managed Care Manual (Pub. 100-16), Ch. 16a § 90.2
Prior Authorization
90.2 – Prior Authorization
(Rev. 99, Issued: 05-27-11, Effective: 05-27-11, Implementation: 05-27-11)
PFFS plans can perform retrospective review of claims for the purpose of verifying
medical necessity and that the service furnished is a covered service. However, PFFS
plans may not require members or providers to obtain prior authorization from the plan as
a condition of coverage. Prior authorization occurs when a plan requires its members or
their providers to seek approval from the plan before the member receives a service from
the provider as a condition of coverage. However, as described below both enrollees and
providers are entitled to request and receive an advance determination of coverage if they
want to ensure that a particular service will be covered by the PFFS plan as described
below under section 100.