20 CFR §217.19

1. (a)Before benefits awarded. If the Board selects a representative for an incompetent claimant (see part 266 of this chapter) after an application is filed but before the benefit is awarded, a new benefit application must be filed by the representative. However, benefits will be paid using the filing date of the original benefit application.
2. (b)After benefits awarded. If the Board selects a representative after a monthly annuity was awarded to another person, the representative must apply as a substitute payee on a form specifically designed for that purpose. A new annuity application is not required.