42 CFR §407.4
- (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.