42 CFR 424.37 - Evidence of authority to sign on behalf of the beneficiary.
(1) Describes his or her relationship to the beneficiary; and
(2) Explains the circumstances that make it impractical for the beneficiary to sign the claim or statement.
(b)Beneficiary not present for services. When a representative of the provider, nonparticipating hospital, or supplier signs a claim or request for payment statement under § 424.36(c), he or she must explain why it was not possible to obtain the beneficiary's signature. (For example: “Patient not physically present for test.”)