Colo. Rev. Stat. § 25.5-5-418
The primary care provider sustainability fund is hereby created in the state treasury. The fund consists of money transferred to the fund from the children's basic health plan trust created in section 25.5-8-105 (1) pursuant to section 25.5-8-105 (8)(b) and any other money that the general assembly may appropriate or transfer to the fund. The state treasurer shall credit all interest and income derived from the deposit and investment of money in the fund to the fund. Any unexpended and unencumbered money in the fund at the end of any fiscal year remains in the fund and shall not be credited or transferred to the general fund or any other fund. Subject to annual appropriation by the general assembly, the state department may expend money from the fund for the purpose of increasing access to primary care through rate enhancements for primary care office visits, preventive medicine visits, counseling and health-risk assessments, immunization administration, health screening services, and newborn care, including neonatal critical care. Money expended from the fund for the purposes of increasing access to primary care through rate enhancements supplements and does not supplant general fund appropriations for that purpose.
C.R.S. § 25.5-5-418