CFR > Title 42 - Public Health > CHAPTER IV—CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER B—MEDICARE PROGRAM (parts 405 to 426) > PART 407—SUPPLEMENTARY MEDICAL INSURANCE (SMI) ENROLLMENT AND ENTITLEMENT > SUBPART A—General Provisions (§407.1 to §407.4) > 407.1—Basis and scope.

407.1—Basis and scope.

(a) Statutory basis. The supplementary medical insurance (SMI) program is authorized by Part B of title XVIII of the Social Security Act.
(1) Section 1831 of the Act establishes the program.
(2) Sections 1836 and 1837 set forth the eligibility and enrollment requirements.
(3) Section 1838 specifies the entitlement periods, which vary depending on the time and method of enrollment and on the basis for termination.
(4) Section 1843 sets forth the requirements for State buy-in agreements under which States may enroll, and pay the SMI premiums for, eligible individuals who are also eligible for cash assistance or Medicaid.
(5) Section 104(b) of the Social Security Amendments of 1965 (Pub. L. 89-87) specifies the limitations that apply to certain aliens and persons convicted of subversive activities.
(b) Scope. This part sets forth the eligibility, enrollment, and entitlement requirements and procedures for supplementary medical insurance. (The rules about premiums are in part 408 of this chapter.)