407.4—Basic requirements for entitlement.
(a)
An individual must meet the following requirements to be entitled to SMI:
(1) Eligibility.
The individual must meet the eligibility requirements specified in § 407.10(a).
(2) Enrollment.
The individual must enroll for SMI, or must be enrolled by a State under a buy-in agreement as specified in § 407.40.
(b)
SMI pays only for covered expenses incurred during an individual's period of entitlement.