How do I shop for health insurance during open enrollment?

Open enrollment is the annual period when you can change your health insurance plan outside of a special qualifying event. For ACA marketplace plans, it runs November 1 through January 15 each year. For employer-sponsored insurance, the window is set by your employer — typically a 2–4 week period in fall. Outside this window, you can only change plans if you qualify for a Special Enrollment Period (SEP). The HealthCare.gov open enrollment guide and CMS consumer resources are the authoritative sources for marketplace rules.

Step 1 — Calculate total annual cost, not just the premium

The monthly premium is the most visible number but rarely the most important. Your real cost exposure is: 12 × monthly premium + likely out-of-pocket spending given your health needs. A $200/month HDHP and a $450/month PPO may cost the same net total if your actual healthcare use is low. Compare by projecting annual spending in a normal year and in a high-use year.

Step 2 — Verify your providers and prescriptions are in-network

Check that your primary care doctor, specialists, and any hospitals you use regularly accept the specific plan — not just the insurer. A provider can be in-network on one plan and out-of-network on another plan offered by the same insurer. Also check your prescription drug formulary: verify your medications are covered and at which tier.

Step 3 — Understand plan types

• HMO (Health Maintenance Organization): requires a primary care physician referral for specialists; lower premiums; limited to in-network providers except emergencies.
• PPO (Preferred Provider Organization): no referrals needed; can see out-of-network providers at higher cost; higher premiums.
• EPO (Exclusive Provider Organization): no referrals needed but strictly in-network only (no out-of-network coverage).
• HDHP (High-Deductible Health Plan): lower premium, higher deductible ($1,650+ individual in 2025); eligible for a Health Savings Account (HSA). Best for healthy, low-utilization individuals.

Step 4 — Check subsidy eligibility on the ACA marketplace

If you're buying on the ACA marketplace (HealthCare.gov or a state exchange), income-based premium tax credits may reduce your monthly premium substantially. Eligibility is based on household income relative to the Federal Poverty Level (FPL). The HealthCare.gov subsidy estimator gives a real-time estimate. Don't skip marketplace shopping without checking subsidy eligibility — many people qualify for significant reductions.

Step 5 — Enroll before the deadline

ACA marketplace plans have coverage that starts January 1 if you enroll by December 15. Enrolling December 16 – January 15 gives you February 1 coverage. Employer plans typically take effect January 1. Missing the deadline means waiting until next year's open enrollment unless you qualify for an SEP (job loss, marriage, birth of a child, move to a new coverage area).