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Prior authorization is the written approval from Horizon, prior to the date of service, for a doctor or other health care professional or facility to provide specific services or supplies. It is sometimes called pre-authorization, prior approval or pre-certification. Your Horizon plan may require prior authorization for certain services before you receive them, except in an emergency. Prior authorization isn’t a promise your health insurance or plan will cover the cost. Your participating doctor will work with Horizon to obtain prior authorization.