Conn. Gen. Stat. § 38a-478j

Each managed care plan that requires a deductible or percentage coinsurance payment by the insured shall calculate the insured's deductible or coinsurance payment on the lesser of the provider's or vendor's charges for the goods or services or the amount payable by the managed care organization or a subcontractor of such managed care organization for such goods or services, except as otherwise required by the laws of a foreign state when applicable to providers, vendors or patients in such foreign state.