CO Rev. Stat. §10-16-113(3)(b)(III)(A)

(III)(A) A physician shall evaluate the first-level appeal and shall consult with an appropriate clinical peer or peers, unless the reviewing physician is a clinical peer; except that, in the case of dental care, a dentist may evaluate the first-level appeal, and the reviewing dentist shall consult with an appropriate clinical peer or peers, unless the reviewing dentist is a clinical peer.  A physician, dentist, or clinical peer who was involved in the initial adverse determination shall not evaluate or be consulted regarding the first-level appeal.  A person who was previously involved with the denial may answer questions.