There are different types of appointment letters that social security disability claimants may receive while their claims are being evaluated.

One common appointment letter is the notice regarding a medical examination that has been scheduled by Disability Determination Services. DDS, of course, is the state agency that evaluates all disability claims for the social security administration.

The second commonly received appointment letter is the notice sent by the Office of Hearings and Appeals, indicating that a hearing date has been set.

In all cases, it is important for social security disability and ssi claimants to acknowledge their receipt of appointment letters, as well as attend the appointments to which they refer. Failure to do either can very easily have negative consequences for a claimant's disability case.