Blue Cross Blue Shield

Most PPO plans from Anthem Blue Cross / Blue Shield of CO

Aetna

Most PPO plans

United Healthcare

Most HMO, EPO, POS, PPO plans, as well as Medicare Advantage plans

Cigna

Most PPO, EPO, HMO and POS plans

Bright HealthCare

Most plans including Medicare Advantage from Bright HealthCare

Kaiser Permanente of Colorado

Most HMO, PPO, POS plans, as well as Medicare Advantage plans

Anthem of Colorado

Most HMO, PPO, POS, EPO plans, as well as Medicare Advantage plans