38 C.F.R. § 17.271
(a) General entitlement. The following persons are eligible for CHAMPVA benefits provided that they are not eligible under Title 10 for the TRICARE Program or Part A of Title XVIII of the Social Security Act (Medicare) except as provided in paragraph (b) of this section.
(4) An eligible child who is pursuing a full-time course of instruction approved under 38 U.S.C. Chapter 36, and who incurs a disabling illness or injury while pursuing such course (between terms, semesters or quarters; or during a vacation or holiday period) that is not the result of his or her own willful misconduct and that results in the inability to continue or resume the chosen program of education must remain eligible for medical care until:
(iii) The twenty-third birthday of the child, whichever occurs first.
(Authority: 38 U.S.C. 501, 1781)
(b) CHAMPVA and Medicare entitlement.
(5) Individuals age 65 or older prior to June 5, 2001, who are entitled to Medicare Part A and who have purchased Medicare Part B must continue to carry Part B to retain CHAMPVA eligibility as secondary payer for services received on or after October 1, 2001.
(Authority: 38 U.S.C. 501, 1781)
Note to paragraph (b)(2): If the person is not eligible for Part A of Medicare, a Social Security Administration “Notice of Disallowance” certifying that fact must be submitted. Additionally, if the individual is entitled to only Part B of Medicare, but not Part A, or Part A through the Premium HI provisions, a copy of the individual's Medicare card or other official documentation noting this must be provided.
Note to § 17.271: Eligibility criteria specific to Dependency and Indemnity Compensation (DIC) benefits are not applicable to CHAMPVA eligibility determinations.
[63 FR 48102, Sept. 9, 1998, as amended at 67 FR 4359, Jan. 30, 2002; 73 FR 65553, Nov. 4, 2008]