Vance Jennings, a Board Certified Social Security Disability Benefits Specialist in North Carolina, explains the critical steps individuals need to follow immediately after their disability claim is denied. Learn 3 reasons why your SSDI claim may be denied. If your disability claim is denied you must act quickly prior to the appeal deadline on the denial letter. The deadline is usually 60 days. If you do not file for appeal by deadline, you will have to start your claim over again. As soon you get your denial letter, call an attorney or file an appeal.