20 CFR §404.115

1. (a)General. You may use the following table to determine the number of quarters of coverage (QCs) you need to be fully insured under § 404.110. Paragraphs (b) and (c) of this section tell you how to use this table.
2. (b)Number of QCs you need. The QCs you need for fully insured status are in column II opposite your date of birth in column I. If a worker dies before reaching retirement age as described in § 404.110(b)(2), the QCs needed for fully insured status are shown in column IV opposite—
   1. (1)The year of death in column III, if the worker was born before January 2, 1930; or
   2. (2)The age in the year of death in column V, if the worker was born after January 1, 1930.
3. (c)How a period of disability affects the number of QCs you need. If you had a period of disability established for you, it affects the number of QCs you need to be fully insured (see § 404.110(c)). For each year which is wholly or partly in a period of disability, subtract one QC from the number of QCs shown in the appropriate line and column of the table as explained in paragraph (b) of this section.