42 CFR 424.127 - Payment to the beneficiary.
(2) The beneficiary, or someone on his or her behalf, submits -
(i) A claim in accordance with § 424.32;
(ii) An itemized hospital bill; and
(iii) Evidence requested by CMS to establish that the services meet the requirements of this subpart.
(c)Conditions for payment for Part B services. Medicare pays the beneficiary for physicians' services and ambulance services as specified in § 424.121, if an itemized bill for the services is submitted by the beneficiary or someone on his or her behalf and the conditions of § 424.126(a) (2) and (3) are met.