42 CFR § 417.533 - Part B carrier responsibilities.
§ 417.533 Part B carrier responsibilities.
In paying for Part B services furnished to its enrollees by suppliers, the HMO or CMP must—
(a) Determine the eligibility of individuals to receive those services through the HMO or CMP;
(b) Make proper coverage decisions and appropriate payment as authorized under § 421.200 of this chapter for the services for which its Medicare enrollees are eligible; and
(c) Carry out any other procedures that CMS may require.