20 CFR 404.1578 : Employees' Benefits (§ 1.1 To Parts 1011-1099) — (Part 400 To Part 499) — Social Security Administration (Part 400 To Part 499) — Federal Old-Age, Survivors And Disability Insurance (1950- ) (§ 404.1 To § 404.2127) — Determining Disability And Blindness (§ 404.1501 To Appendix 2 To Subpart P Of Part 404) — Widows, Widowers, And Surviving Divorced Spouses (§ 404.1577 To § 404.1579) — How we determine disability for widows, widowers, and surviving divorced spouses for monthly benefits payable for months prior to January 1991.

(a) For monthly benefits payable for months prior to January 1991, we will find that you were disabled and pay you widow's or widower's benefits as a widow, widower, or surviving divorced spouse if -

(1) Your impairment(s) had specific clinical findings that were the same as those for any impairment in the Listing of Impairments in appendix 1 of this subpart or were medically equivalent to those for any impairment shown there;

(2) Your impairment(s) met the duration requirement.

(b) However, even if you met the requirements in paragraphs (a) (1) and (2) of this section, we will not find you disabled if you were doing substantial gainful activity.