C.R.S. § 25-37-110

(1) Upon sixty days’ notice, a health-care provider may decline to provide service pursuant to a contract to new patients covered by the person or entity. The notice shall state the reason or reasons for this action. (2) As used in this section, “new patients” means those patients who have not received services from the health-care provider in the immediately preceding three years. A patient shall not become a “new patient” solely by changing coverage from one person or entity to another person or entity.