Open enrollment arrives once a year, and most employees make their health insurance selection in under 10 minutes. That decision affects thousands of dollars in annual costs and access to the doctors and treatments they need. It is one of the most consequential financial choices most working adults make, and most people make it on autopilot. Here is how to do it properly.
Understanding the Plan Types
HMO (Health Maintenance Organization)
You choose a primary care physician (PCP) who coordinates your care. Referrals are required to see specialists. You must use in-network providers except in emergencies — out-of-network care is typically not covered at all on an HMO. In exchange for this restriction, premiums and out-of-pocket costs are typically lower than PPOs.
Best for: people who have or are comfortable establishing a PCP relationship, do not need frequent specialist visits without a referral, and want lower monthly premiums. HMOs work well when your preferred doctors are in-network and you don't anticipate needing out-of-network care.
PPO (Preferred Provider Organization)
You can see any doctor without a referral, including specialists. In-network care costs less; out-of-network care is covered but at a higher cost-sharing level. More flexibility comes with higher premiums — PPOs consistently cost more than HMOs for comparable coverage levels.
Best for: people who see specialists frequently and want the ability to self-refer, people with established relationships with specific doctors who may not be in an HMO network, and people who travel frequently and want coverage flexibility across geographies.
EPO (Exclusive Provider Organization)
A hybrid: like a PPO in that no referrals are required, but like an HMO in that out-of-network care is not covered (except emergencies). EPOs typically cost less than PPOs. They're worth considering if you want the flexibility of no referrals but are comfortable staying within a specific network.
HDHP (High-Deductible Health Plan)
Higher deductible (minimum $1,650 for individual coverage in 2026), lower monthly premium. The defining feature: HDHPs are the only plan type eligible for a Health Savings Account (HSA). An HSA lets you contribute pre-tax dollars — $4,400 for individual coverage or $8,750 for family coverage in 2026 — to a dedicated account for medical expenses. That money rolls over indefinitely (there's no "use it or lose it"), can be invested, and grows tax-free.
Best for: generally healthy people who don't anticipate high medical costs, people who want the triple tax advantage of an HSA (pre-tax contributions, tax-free growth, tax-free withdrawals for medical expenses), and people building a long-term medical savings buffer for retirement healthcare costs.
The Total Annual Cost Calculation
The single biggest mistake in plan selection is comparing plans on monthly premium alone. A plan with a $200 lower monthly premium but a $3,000 higher deductible is not necessarily cheaper — it depends entirely on how much healthcare you use.
The right comparison is total annual cost under realistic scenarios:
Total Annual Cost = (Monthly Premium × 12) + Expected Out-of-Pocket Costs
Model three scenarios for each plan you're considering:
- Healthy year: You use only preventive care, which is covered at 100% under ACA-compliant plans. Total cost = annual premium only. No deductible, no copays.
- Moderate year: A few primary care visits, one specialist, a minor procedure or prescription. Estimate your realistic out-of-pocket based on the plan's copay and deductible structure.
- Worst case: You hit your out-of-pocket maximum due to a serious illness or injury. Total cost = annual premium + out-of-pocket maximum. This is your maximum possible annual exposure.
A Side-by-Side Example
Comparing a PPO and an HDHP for a generally healthy individual:
| Feature | PPO | HDHP + HSA |
|---|---|---|
| Monthly premium | $350 | $180 |
| Annual premium | $4,200 | $2,160 |
| Deductible | $1,000 | $2,500 |
| Out-of-pocket max | $6,000 | $5,000 |
| HSA tax savings (23% bracket, $4,400 contribution) | $0 | ~$1,012 |
| Total cost — healthy year | $4,200 | $1,170 (after HSA savings) |
| Total cost — worst case year | $10,200 | $7,160 (after HSA savings) |
In this example, the HDHP wins in both the healthy year and the worst case — largely because the premium savings and HSA tax advantage are substantial. This isn't always the case; it depends on the specific plans available to you and your expected healthcare use.
Network Verification: Do This Before Enrolling
Before selecting any plan, verify that the providers who matter to you are in-network. This means your primary care physician, any specialists you see regularly, your preferred hospital, and any mental health providers you use.
Do not rely solely on the online provider directory. Health plan directories are notoriously inaccurate — providers join and leave networks constantly, and the directories often lag by months. Call the provider's office directly, give them the plan name and network name, and ask them to confirm they are in-network and accepting new patients on that plan.
An out-of-network surprise bill can easily exceed $5,000–10,000 for a specialist visit or procedure. That cost can wipe out an entire year's premium savings from choosing a lower-cost plan. Network verification is not optional — it is the most important pre-enrollment step.
The HSA Advantage — More Than Just a Medical Account
If you choose an HDHP and are eligible for an HSA, the financial benefits extend well beyond paying for doctor visits with pre-tax dollars. The HSA's triple tax advantage — pre-tax contributions, tax-free growth, tax-free withdrawals for qualified medical expenses — is unmatched by any other account type in the US tax code.
The strategic long-term play: contribute the maximum to your HSA each year, invest the funds in low-cost index funds (most HSA providers offer investment options once you reach a minimum balance), and pay current medical expenses out of pocket if you can afford to. Save your receipts. Years or decades later, you can reimburse yourself for those historical medical expenses tax-free — there is no time limit on reimbursements. Meanwhile, the invested HSA funds compound tax-free.
After age 65, HSA funds can be withdrawn for any purpose — not just medical expenses — with the withdrawal taxed as ordinary income, just like a traditional IRA. In practice, most retirees have substantial qualified medical expenses (Medicare premiums, dental, vision, long-term care) that can be paid tax-free from the HSA indefinitely.
An HSA funded consistently at $4,000 per year over 25 years, invested at 7% annual return, grows to approximately $270,000 — entirely tax-free for medical expenses.
Checklist: What to Review During Open Enrollment
- Has anything changed? New prescription, new specialist, new baby on the way — life changes shift which plan is optimal.
- Did the plan design change? Employers often adjust deductibles, copays, and premiums year to year. Don't assume last year's best choice is still correct.
- Are your providers still in-network? Networks change. Verify annually, not just when you first enroll.
- What are your realistic medical costs for next year? A planned surgery, a pregnancy, or ongoing specialist care changes the math significantly.
- Are you maximizing your HSA if enrolled in an HDHP? Many eligible employees contribute far below the annual maximum.
- Do you have an FSA deadline? Unlike HSAs, FSAs have use-it-or-lose-it rules (with a limited grace period or rollover). Check your balance before year end.
Use our Health Insurance Calculator to model your total annual cost across plan options based on your expected healthcare use.
One More Thing: Don't Overlook Mental Health Parity
The Mental Health Parity and Addiction Equity Act requires that mental health and substance use disorder benefits be covered no more restrictively than comparable medical and surgical benefits. In practice, verify that the plan covers therapy visits at a reasonable copay, that prior authorization requirements aren't excessive, and that there are in-network therapists and psychiatrists actually accepting new patients in your area. Mental health network adequacy is one of the most frequently cited coverage complaints — check it before you enroll, not after you need it.