Enrollment periods

An individual may enroll in the insurance program established by this part only in such manner and form as may be prescribed by regulations, and only during an enrollment period prescribed in or under this section.

In the case of individuals who first satisfy paragraph (1) or (2) of section 1395 o (a) of this title before March 1, 1966 , the initial general enrollment period shall begin on the first day of the second month which begins after July 30, 1965 , and shall end on May 31, 1966 . For purposes of this subsection and subsection (d), an individual who has attained age 65 and who satisfies paragraph (1) of section 1395 o (a) of this title but not paragraph (2) of such section shall be treated as satisfying such paragraph (1) on the first day on which he is (or on filing application would have been) entitled to hospital insurance benefits under part A.

In the case of an individual who first satisfies paragraph (1) or (2) of section 1395 o (a) of this title on or after March 1, 1966 , his initial enrollment period shall begin on the first day of the third month before the month in which he first satisfies such paragraphs and shall end seven months later. Where the Secretary finds that an individual who has attained age 65 failed to enroll under this part during his initial enrollment period (based on a determination by the Secretary of the month in which such individual attained age 65), because such individual (relying on documentary evidence) was mistaken as to his correct date of birth, the Secretary shall establish for such individual an initial enrollment period based on his attaining age 65 at the time shown in such documentary evidence (with a coverage period determined under section 1395q of this title as though he had attained such age at that time).

There shall be a general enrollment period during the period beginning on January 1 and ending on March 31 of each year.

Any individual—

(1) who is eligible under section 1395 o (a) of this title to enroll in the medical insurance program by reason of entitlement to hospital insurance benefits as described in paragraph (1) of such section, and

(2) whose initial enrollment period under subsection (d) begins after March 31, 1973 , and

(3) who is residing in the United States, exclusive of Puerto Rico,

shall be deemed to have enrolled in the medical insurance program established by this part.

All of the provisions of this section shall apply to individuals satisfying subsection (f), except that—

(1) in the case of an individual who satisfies subsection (f) by reason of entitlement to disability insurance benefits described in section 426(b) of this title , his initial enrollment period shall begin on the first day of the later of (A) April 1973 or (B) the third month before the 25th month of such entitlement, and shall reoccur with each continuous period of eligibility (as defined in section 1395r(d) of this title ) and upon attainment of age 65;

(2) (A) in the case of an individual who is entitled to monthly benefits under section 402 or 423 of this title on the first day of his initial enrollment period or becomes entitled to monthly benefits under section 402 of this title during the first 3 months of such period, his enrollment shall be deemed to have occurred in the third month of his initial enrollment period, and (B) in the case of an individual who is not entitled to benefits under section 402 of this title on the first day of his initial enrollment period and does not become so entitled during the first 3 months of such period, his enrollment shall be deemed to have occurred in the month in which he files the application establishing his entitlement to hospital insurance benefits provided such filing occurs during the last 4 months of his initial enrollment period; and

(3) in the case of an individual who would otherwise satisfy subsection (f) but does not establish his entitlement to hospital insurance benefits until after the last day of his initial enrollment period (as defined in subsection (d) of this section), his enrollment shall be deemed to have occurred on the first day of the earlier of the then current or immediately succeeding general enrollment period (as defined in subsection (e) of this section).

In any case where the Secretary finds that an individual’s enrollment or nonenrollment in the insurance program established by this part or part A pursuant to section 1395i–2 of this title is unintentional, inadvertent, or erroneous and is the result of the error, misrepresentation, or inaction of an officer, employee, or agent of the Federal Government, or its instrumentalities, the Secretary may take such action (including the designation for such individual of a special initial or subsequent enrollment period, with a coverage period determined on the basis thereof and with appropriate adjustments of premiums) as may be necessary to correct or eliminate the effects of such error, misrepresentation, or inaction.

(1) In the case of an individual who— (A) at the time the individual first satisfies paragraph (1) or (2) of section 1395 o (a) of this title, is enrolled in a group health plan described in section 1395y(b)(1)(A)(v) of this title by reason of the individual’s (or the individual’s spouse’s) current employment status, and (B) has elected not to enroll (or to be deemed enrolled) under this section during the individual’s initial enrollment period, there shall be a special enrollment period described in paragraph (3). In the case of an individual not described in the previous sentence who has not attained the age of 65, at the time the individual first satisfies paragraph (1) of section 1395 o (a) of this title, is enrolled in a large group health plan (as that term is defined in section 1395y(b)(1)(B)(iii) of this title ) by reason of the individual’s current employment status (or the current employment status of a family member of the individual), and has elected not to enroll (or to be deemed enrolled) under this section during the individual’s initial enrollment period, there shall be a special enrollment period described in paragraph (3)(B).

(2) In the case of an individual who— (A) (i) has enrolled (or has been deemed to have enrolled) in the medical insurance program established under this part during the individual’s initial enrollment period, or (ii) is an individual described in paragraph (1)(A); (B) has enrolled in such program during any subsequent special enrollment period under this subsection during which the individual was not enrolled in a group health plan described in section 1395y(b)(1)(A)(v) of this title by reason of the individual’s (or individual’s spouse’s) current employment status; and (C) has not terminated enrollment under this section at any time at which the individual is not enrolled in such a group health plan by reason of the individual’s (or individual’s spouse’s) current employment status, there shall be a special enrollment period described in paragraph (3). In the case of an individual not described in the previous sentence who has not attained the age of 65, has enrolled (or has been deemed to have enrolled) in the medical insurance program established under this part during the individual’s initial enrollment period, or is an individual described in the second sentence of paragraph (1), has enrolled in such program during any subsequent special enrollment period under this subsection during which the individual was not enrolled in a large group health plan (as that term is defined in section 1395y(b)(1)(B)(iii) of this title ) by reason of the individual’s current employment status (or the current employment status of a family member of the individual), and has not terminated enrollment under this section at any time at which the individual is not enrolled in such a large group health plan by reason of the individual’s current employment status (or the current employment status of a family member of the individual), there shall be a special enrollment period described in paragraph (3)(B).

(3) (A) The special enrollment period referred to in the first sentences of paragraphs (1) and (2) is the period including each month during any part of which the individual is enrolled in a group health plan described in section 1395y(b)(1)(A)(v) of this title by reason of current employment status ending with the last day of the eighth consecutive month in which the individual is at no time so enrolled. (B) The special enrollment period referred to in the second sentences of paragraphs (1) and (2) is the period including each month during any part of which the individual is enrolled in a large group health plan (as that term is defined in section 1395y(b)(1)(B)(iii) of this title ) by reason of the individual’s current employment status (or the current employment status of a family member of the individual) ending with the last day of the eighth consecutive month in which the individual is at no time so enrolled.

(4) (A) In the case of an individual who is entitled to benefits under part A pursuant to section 426(b) of this title and— (i) who at the time the individual first satisfies paragraph (1) of section 1395 o (a) of this title— (I) is enrolled in a group health plan described in section 1395y(b)(1)(A)(v) of this title by reason of the individual’s current or former employment or by reason of the current or former employment status of a member of the individual’s family, and (II) has elected not to enroll (or to be deemed enrolled) under this section during the individual’s initial enrollment period; and (ii) whose continuous enrollment under such group health plan is involuntarily terminated at a time when the enrollment under the plan is not by reason of the individual’s current employment or by reason of the current employment of a member of the individual’s family, there shall be a special enrollment period described in subparagraph (B). (B) The special enrollment period referred to in subparagraph (A) is the 6-month period beginning on the first day of the month which includes the date of the enrollment termination described in subparagraph (A)(ii).

In applying this section in the case of an individual who is entitled to benefits under part A pursuant to the operation of section 426(h) of this title , the following special rules apply:

(1) The initial enrollment period under subsection (d) shall begin on the first day of the first month in which the individual satisfies the requirement of section 1395 o (a)(1) of this title.

(2) In applying subsection (g)(1), the initial enrollment period shall begin on the first day of the first month of entitlement to disability insurance benefits referred to in such subsection.

(1) In the case of an individual who— (A) at the time the individual first satisfies paragraph (1) or (2) of section 1395 o (a) of this title, is described in paragraph (3), and has elected not to enroll (or to be deemed enrolled) under this section during the individual’s initial enrollment period; or (B) has terminated enrollment under this section during a month in which the individual is described in paragraph (3), there shall be a special enrollment period described in paragraph (2).

(2) The special enrollment period described in this paragraph is the 6-month period beginning on the first day of the month which includes the date that the individual is no longer described in paragraph (3).

(3) For purposes of paragraph (1), an individual described in this paragraph is an individual who— (A) is serving as a volunteer outside of the United States through a program— (i) that covers at least a 12-month period; and (ii) that is sponsored by an organization described in section 501(c)(3) of the Internal Revenue Code of 1986 and exempt from taxation under section 501(a) of such Code; and (B) demonstrates health insurance coverage while serving in the program.

(1) In the case of any individual who is a covered beneficiary (as defined in section 1072(5) of title 10 ) at the time the individual is entitled to part A under section 426(b) of this title or section 426–1 of this title and who is eligible to enroll but who has elected not to enroll (or to be deemed enrolled) during the individual’s initial enrollment period, there shall be a special enrollment period described in paragraph (2).

(2) The special enrollment period described in this paragraph, with respect to an individual, is the 12-month period beginning on the day after the last day of the initial enrollment period of the individual or, if later, the 12-month period beginning with the month the individual is notified of enrollment under this section.

(3) In the case of an individual who enrolls during the special enrollment period provided under paragraph (1), the coverage period under this part shall begin on the first day of the month in which the individual enrolls, or, at the option of the individual, the first month after the end of the individual’s initial enrollment period.

(4) An individual may only enroll during the special enrollment period provided under paragraph (1) one time during the individual’s lifetime.

(5) The Secretary shall ensure that the materials relating to coverage under this part that are provided to an individual described in paragraph (1) prior to the individual’s initial enrollment period contain information concerning the impact of not enrolling under this part, including the impact on health care benefits under the TRICARE program under chapter 55 of title 10.

(6) The Secretary of Defense shall collaborate with the Secretary of Health and Human Services and the Commissioner of Social Security to provide for the accurate identification of individuals described in paragraph (1). The Secretary of Defense shall provide such individuals with notification with respect to this subsection. The Secretary of Defense shall collaborate with the Secretary of Health and Human Services and the Commissioner of Social Security to ensure appropriate follow up pursuant to any notification provided under the preceding sentence.

(1) Any individual who is eligible for coverage of immunosuppressive drugs under section 1395 o (b) of this title may enroll or be deemed to have enrolled only in such manner and form as may be prescribed by regulations, and only during an enrollment period described in this subsection.

(2) An individual described in paragraph (1) whose entitlement for hospital insurance benefits under part A ends by reason of section 426–1(b)(2) of this title prior to January 1, 2023 , may enroll beginning on October 1, 2022 , or the day on which the individual first satisfies section 1395 o (b) of this title, whichever is later.

(3) An individual described in paragraph (1) whose entitlement for hospital insurance benefits under part A ends by reason of section 426–1(b)(2) of this title on or after January 1, 2023 , shall be deemed to have enrolled in the medical insurance program established by this part for purposes of coverage of immunosuppressive drugs.

(4) The Secretary shall establish a process under which an individual described in paragraph (1) whose other coverage described in section 1395 o (b)(2)(A) of this title, or coverage under this part (including the medical insurance program established under this part for purposes of coverage of immunosuppressive drugs), is terminated voluntarily or involuntary 1 1 So in original. Probably should be “involuntarily”. may enroll or reenroll, if applicable, in the medical insurance program established under this part for purposes of coverage of immunosuppressive drugs.

(1) In the case of an individual who— (A) as of January 1, 2024 , is— (i) a Postal Service annuitant who is entitled to benefits under part A of this subchapter, but excluding an individual who is eligible to enroll under such part under section 1395i–2 of this title or 1395i–2a of this title; or (ii) a member of family (as defined in section 8901(5) of title 5 ) of a Postal Service annuitant and is entitled to benefits under part A of this subchapter, but excluding an individual who is eligible to enroll under such part under section 1395i–2 of this title or 1395i–2a of this title; and (B) is not enrolled under this part, the individual may elect to be enrolled under this part during a special enrollment period during the 6-month period beginning on April 1, 2024 .

(2) In this subsection, the term “Postal Service annuitant” means an annuitant enrolled in a health benefits plan under chapter 89 of title 5, whose Government contribution is required to be paid under section 8906(g)(2) of such title.