5 C.F.R. § 178.103
Claim filed by a claimant's representative.
A claim filed by a claimant's representative must be supported by a duly executed power of attorney or other documentary evidence of the representative's right to act for the claimant.
A claim filed by a claimant's representative must be supported by a duly executed power of attorney or other documentary evidence of the representative's right to act for the claimant.