1. Short title This Act may be cited as the Medicare Buy-In and Health Care Stabilization Act of 2017 . 2. Medicare buy-in option (a) In general Title XVIII of the Social Security Act ( 42 U.S.C. 1395c et seq.) is amended by adding at the end the following new section: 1899C. Medicare buy-in option (a) Option (1) Eligibility Every individual who meets the requirements described in paragraph (3) shall be eligible to enroll under this section. (2) In general An individual who meets the following requirements is eligible to enroll under this section: (A) Age The individual has attained 50 years of age, but has not attained 65 years of age. (B) Medicare eligibility (but for age) The individual is not otherwise entitled to benefits under part A or eligible to enroll under part A or part B but would be eligible for benefits under part A or part B if the individual were 65 years of age. (3) Benefits An individual enrolled under this section is entitled to the same benefits under this title as an individual who is entitled to benefits under part A and enrolled under parts B and D. (b) Enrollment and coverage periods The Secretary shall establish enrollment and coverage periods for individuals who enroll under this section. Such periods shall be established in coordination with the enrollment and coverage periods for plans offered under an Exchange established under title I of the Patient Protection and Affordable Care Act. The Secretary shall establish such periods so that coverage under this section shall first begin on January 1 of the first year beginning at least one year after the date of the enactment of this section. (c) Buy-In premium (1) Amount of monthly premiums The Secretary shall (beginning for the first year that begins more than 1 year after the date of the enactment of this section), during September of the preceding year, determine a monthly premium for individuals enrolled under this section. Such monthly premium shall be equal to 1/12 of the annual premium computed under paragraph (2)(B), which shall