20 C.F.R. § 404.120 How we determine currently insured status.
Title 20 - Employees' Benefits
(a) What the period is for determining currently insured status. You are currently insured if you have at least 6 quarters of coverage (QCs) during the 13-quarter period ending with the quarter in which you— (1) Die; (2) Most recently became entitled to disability insurance benefits; or (3) Became entitled to old-age insurance benefits. (b) What quarters are not counted as part of the 13-quarter period. We do not count as part of the 13-quarter period any quarter all or part of which is included in a period of disability established for you, except that the first and last quarters of the period of disability may be counted if they are QCs (see §404.146(d)).
Title 20: Employees' Benefits
PART 404—FEDERAL OLD-AGE, SURVIVORS AND DISABILITY INSURANCE (1950– )
Subpart B—Insured Status and Quarters of Coverage
Currently Insured Status
§ 404.120 How we determine currently insured status.