Code of Federal Regulations Title 42. Public Health § 42.423.512 Minimum enrollment requirements

(1) At least 5,000 individuals are enrolled for the purpose of receiving prescription drug benefits from the organization;  or

(2) At least 1,500 individuals are enrolled for purposes of receiving prescription drug benefits from the organization and the organization primarily serves individuals residing outside of urbanized areas as defined in § 412.62(f) of this chapter;

(3) Except as provided for in paragraph (b) of this section, a Part D plan sponsor must maintain a minimum enrollment as defined in paragraphs (a)(1) and (a)(2) of this section for the duration of its contract.