The bill prohibits, until the conclusion of a national emergency declared by the U.S. president in response to the 2019 novel coronavirus or June 30, 2021, whichever is earlier, a defined network plan, including a health maintenance organization, or preferred provider plan from requiring an enrollee of the plan to pay more for a service, treatment, or supply provided by an out-of-network provider than if the service, treatment, or supply is provided by an in-network provider. This prohibition applies to any service, treatment, or supply that is related to the diagnosis of or treatment for COVID-19 and that is provided by an out-of-network provider because a participating provider is unavailable due to the emergency. For a service, treatment, or supply provided under those circumstances, the bill requires the plan to reimburse the out-of-network provider at 225 percent of the federal Medicare program rate. Also, under those circumstances, any health care provider or facility that provides a service, treatment, or supply to an enrollee of a plan but is not a participating provider of that plan shall accept as payment in full any payment by a plan that is at least 225 percent of the federal Medicare program rate and may not charge the enrollee an amount that exceeds the amount that the provider or facility is reimbursed by the plan.