How to Compute Second-Entitlement Primary Insurance Amounts 12 Months or More after Entitlement to Disability Benefits Ended, § 404.252
If you’ve experienced a period of disability and have received disability insurance benefits, special computation rules apply to your primary insurance amount when you become eligible for old-age insurance benefits or disability insurance benefits after 1978 or if you become re-entitled to disability insurance benefits or die. If the second entitlement occurs more than 12 …