If you are receiving Social Security old-age benefits at your full principal insurance amount (PIA) then there are no additional benefits for your disability. If you are receiving "early retirement" benefits in which your PIA has been discounted, then qualifying for disability would restore your benefit to your full PIA.
I have changed your practice area away from "employment" to "Social Security ," and will try to add a VA tag.
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This answer is offered as a public service for general information only and may not be relied upon as legal advice.