Res judicata is a rule that provides that once an issue is decided it does not need
to be decided again. If a recipient, or his or her representative, files multiple
waiver requests for the same overpayment, raises no new issues and provides no new
facts or material evidence, we will apply res judicata.
Res judicata allows us to adopt a prior determination denying a waiver request when
the recipient or his or her representative fails to provide new and material evidence.