Hospitals: Colorado mandates that hospitals keep records for ten (10) years after the most recent patient care. In the case of minors, Colorado requires retention of records for ten (10) years following the patient turning 18.
Physicians: Colorado does not offer medical records retention guidance for private practices. Consult LINK for more on what to do when your state offers limited legal guidelines for medical records retention policy.
6 COLO. CODE REGS. § 1011-1: IV-8.102