45 CFR § 155.1050
Establishment of Exchange network adequacy standards
April 14, 2021
(a) An Exchange must ensure that the provider network of each QHP meets the standards specified in §156.230 of this subtitle, except for multi-State plans.
(b) The U.S. Office of Personnel Management will ensure compliance with the standards specified in §156.230 of this subtitle for multi-State plans.
(c) A QHP issuer in an Exchange may not be prohibited from contracting with any essential community provider designated under §156.235(c) of this subtitle.