Colorado Medicaid runs a Regional Accountable Entity (RAE) model — 5 regions managing physical, behavioral, and long-term care under one administrative umbrella. Commercial payers include Anthem, Cigna, and Aetna. Timely filing is 180 days for most payers. The Denver metro and rural mountain counties have very different payer mixes and authorization burdens.
Colorado structures Medicaid differently than most states: instead of full-risk MCOs, Health First Colorado uses Regional Accountable Entities (RAEs) that coordinate care while most physical health claims pay fee-for-service through the state — with behavioral health capitated through the RAEs. Kaiser Permanente's large closed-network presence and a strong state exchange (Connect for Health Colorado) round out a distinctive market.
Administered by the Department of Health Care Policy & Financing (HCPF). The patient's plan assignment — not just Medicaid eligibility — determines the portal, prior-auth list, and filing rules that apply.
| Plan | Notes |
|---|---|
| Regional Accountable Entities (RAEs) | Care coordination + behavioral health capitation by region — physical health largely pays FFS through HCPF |
| Denver Health Medicaid Choice | One of two true managed care plans |
| Rocky Mountain Health Plans Prime | Western-slope managed care option |
Initial-claim windows for the payers Colorado practices bill most. Commercial limits are contract-specific — always confirm against your provider agreement and the payer's current manual.
Verified against payer publications at time of writing (July 2026). Filing limits change by contract and plan year — treat this table as a starting point, not a substitute for the payer manual. See our methodology.
Colorado’s physical health Medicaid mostly runs fee-for-service billed directly to the state, while behavioral health services are capitated through Regional Accountable Entities (RAEs). This means a single patient can require two separate workflows depending on the service rendered. Billing staff must identify the service type first — not just the payer — before routing the claim. Submitting a behavioral health claim to the FFS state system instead of the RAE will result in rejection that is not a timely filing exception.
Colorado is divided into seven RAE regions, each administered by a different organization. The RAE that handles the patient’s behavioral health capitation is determined by their county of residence, not the provider’s location. A Denver-area provider seeing a patient from a different county must bill that patient’s assigned RAE, which may be a different organization than the one covering the provider’s own county. Verify the patient’s RAE assignment through the Colorado PEAK portal or the Health First Colorado provider portal before submitting BH claims.
Kaiser Permanente Colorado’s concentration in the Denver-Boulder Front Range corridor means a meaningful share of commercial patients in that market are Kaiser members in a closed-network HMO. Non-participating providers who see Kaiser members out-of-network face strict claim routing rules and limited reimbursement outside emergencies. Practices in the Front Range corridor should have a defined protocol for Kaiser out-of-network encounters — including collecting the member’s Kaiser ID, understanding the emergency versus urgent distinction, and routing claims to Kaiser’s regional claims address rather than a commercial clearinghouse.
Practices in ski resort communities (Summit County, Eagle County, Pitkin County, and similar) regularly encounter patients insured by out-of-state Blues plans (processed through BlueCard), international travel insurance, and employer plans domiciled in other states. BlueCard claims route through the patient’s home Blue plan, not Colorado’s Anthem/BCBS — verify the Alpha Prefix on the card to route correctly. Travel insurance claims often require pre-certification proof and may demand itemized bills in formats different from standard CMS-1500 workflows.
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Frequently billed codes in this state’s payer environment, with notes on state-specific rules and common denial patterns.
Codes and reimbursement rates change annually. Verify current fee schedules with each payer before billing. Full code lookup →