Where the right to collect premiums under the Employees' Pension Insurance Act, with respect to an insured period of Employees' Pension Insurance, has been extinguished by prescription (excluding a case falling under the proviso to Article 75 of that Act), the insured period as a category 2 insured person for the months that were the basis for calculating the insured period of Employees' Pension Insurance to which those premiums relate is not, notwithstanding the provisions of Article 5, paragraph (1), included in the premium-paid period. The same applies to the insured period as a category 3 insured person of the spouse of that person for the months that were the basis for calculating the insured period of Employees' Pension Insurance, in a case where the spouse of that person is a category 3 insured person.