42 CFR §414.406

1. (a)Implementation contractor. CMS designates one or more implementation contractors for the purpose of implementing this subpart.
2. (b)Competitive bidding areas. CMS designates through program instructions or by other means, such as the request for bids, each CBA in which a competitive bidding program may be implemented under this subpart.
3. (c)Revisions to competitive bidding areas. CMS may revise the CBAs designated under paragraph (b) of this section.
4. (d)Competitively bid items. CMS designates the items that are included in a competitive bidding program through program instructions or by other means
5. (e)Claims processing. The Durable Medical Equipment Medicare Administrative Contractor designated to process DMEPOS claims for a particular geographic region also processes claims for items furnished under a competitive bidding program in the same geographic region.