20 CFR 217.5: When an application is a claim for an annuity or lump sum.

An application is a claim for an annuity or lump sum if it meets all of the following conditions:

(a) It is on an application form completed and filed with the Board as described in § 217.6;

(b) It is signed by the claimant or by someone described in § 217.17 who can sign the application for the claimant;

(c) It is filed with the Board on or before the date of death of the claimant. (See § 217.10 for limited exceptions.)