Am I required to utilize Healthcare Blue Book if I am on a District medical plan?

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Absolutely not. Healthcare Blue Book is a resource available to help you become an educated consumer of healthcare, as you are for other products and services. 
Because the District is a self-funded medical plan, all members benefit from cost containment. So, cash rewards are available for employees who choose fair-priced providers for common services. (fifteen services are eligible, such as a colonoscopy.)