According to the Social Security Disability and SSI Resource Center, verification of an approved disability claim arrives by mail. Social Security sends a notice of the decision. If it has been denied, the state disability agency sends a denial letter.
Social Security sends written notice of the decision within 90 days; if the approval or denial does not arrive in that time, the local Social Security office can provide information on the status of the claim. It is also possible to call the SSA for a toll-free automated system that reveals the status of the claim.
It is important to check on the status of a disability claim periodically to see whether a decision has been made. If it has been denied and it has not yet arrived in the mail, it is possible that the 60-day window for appealing the rejection may lapse.