What Is a HMO (Health Maintenance Organization)?
An HMO covers only in-network care except in a true emergency, and usually requires you to name a primary care physician who coordinates referrals to specialists. In exchange for those restrictions, HMOs are typically the lowest-premium option on the marketplace.
Best suited to: people who are comfortable staying in one network and want the lowest premium.
HMO Availability on the Colorado Marketplace (2026)
HMO availability in Colorado is decided county by county rather than statewide, and the mix of plan types offered on a state's marketplace changes year to year. Confirm what is actually available in your ZIP code's rating area before assuming a HMO is on the menu.
How to Compare HMO Plans in Colorado
- Network first, premium second. Confirm your doctors and hospital participate in the specific plan — not just the carrier. Carriers run multiple networks.
- Deductible and out-of-pocket maximum. The OOP max is your true worst case for the year.
- Drug formulary. Check your prescriptions by name and tier.
- Referral rules. HMO and POS designs typically require a referral to see a specialist.
- Subsidy interaction. Cost-sharing reductions only attach to Silver plans, which can make Silver the better value even at a higher premium.
Frequently Asked Questions
Are HMO plans available in Colorado for 2026?
HMO availability in Colorado varies by county and changes year to year, so confirm what is offered in your ZIP code's rating area.
What is the difference between HMO and the other plan types?
PPO plans cover out-of-network care at higher cost sharing and need no referral. POS plans cover out-of-network care but usually require a referral. EPO plans require no referral but cover out-of-network care only in emergencies. HMO plans generally require both a network provider and a referral. The out-of-network benefit and the referral rule are the two variables that matter.
Does HMO cost more in Colorado?
Plan type is only one factor in price. Age, county rating area, metal tier, and tobacco use all affect the premium, and subsidies are calculated against a benchmark Silver plan regardless of the plan type you choose.
Can I switch plan types mid-year in Colorado?
Only with a qualifying life event that opens a Special Enrollment Period — losing coverage, moving, marriage, or a new baby, among others. Otherwise plan changes happen during Open Enrollment, November 1 through January 15.