Approximately 66% of all initial SSDI claims are denied, as reported by AARP. However, you can file an appeal if your claim is denied. Most claims are initially rejected because the application was not completed correctly or the applicant failed to provide sufficient documentation. When you appeal your claim, addressing any issues or reasons why the claim was initially denied is essential. There are also deadlines for filing an appeal. If you miss these, then you have to start your application process all over. Unfortunately, it can take several months or even a year to be approved for social security disability. So, you need to ensure your application is filed correctly the first time. This is why getting help from social security lawyers for disability claims is vital.