45 CFR § 156.100 - State selection of benchmark plan for plan years beginning prior to January 1, 2020.
(1) Small group market health plan. The largest health plan by enrollment in any of the three largest small group insurance products by enrollment, as defined in § 159.110 of this subpart, in the State's small group market as defined in § 155.20 of this subchapter.
(3) FEHBP plan. Any of the largest three national Federal Employees Health Benefits Program (FEHBP) plan options by aggregate enrollment that is offered to all health-benefits-eligible federal employees under 5 USC 8903.
(b) EHB-benchmark selection standards. In order to become an EHB-benchmark plan as defined in § 156.20 of this subchapter, a state-selected base-benchmark plan must meet the requirements for coverage of benefits and limits described in § 156.110 of this subpart; and
(c) Default base-benchmark plan. If a State does not make a selection using the process described in this section, the default base-benchmark plan will be the largest plan by enrollment in the largest product by enrollment in the State's small group market.