These extra credits do not increase your benefit amount. The average of your earnings over your working years counts, not the total number of credits you earn.
Let's say I got disabled at 27, how many credits would I require for the disability benefits?
You would need 3 years of work, 12 credits out of the past 6 years between ages 21 and 27.
What would happen if I do not know the information requested on the application form?