Choosing a health insurance plan by the monthly premium alone is one of the most common mistakes in open enrollment. A low premium can hide a high deductible, high coinsurance, or a narrow network, and a high premium can be good value if you use care regularly. The right comparison is not premium versus premium. It is total yearly cost, plus whether your doctors and medicines are covered.
This guide explains how to choose a health insurance plan using that total-cost method, with worked illustrative examples, so you can compare plans on the same basis instead of guessing from the headline price.
The Five Terms You Must Understand First
Before you compare plans, learn five terms, because every plan comparison depends on them.
Premium is the amount you pay each month to keep the plan, whether or not you use care. Deductible is the amount you pay out of pocket for covered care before the plan starts paying its share, though some services, such as preventive care, may be covered before the deductible. Copay is a fixed amount you pay for a specific service, such as a doctor visit or a prescription, often after the deductible or sometimes instead of it, depending on the plan. Coinsurance is a percentage of the cost you pay after the deductible, such as 20% of a hospital bill. Out-of-pocket maximum is the most you will pay in a year for covered care, after which the plan pays 100% of covered costs for the rest of the year.
These terms interact, so no single one tells you the full cost: a low-premium, high-deductible plan can be cheap in a healthy year and expensive after a major illness, and vice versa.
How to Choose a Health Insurance Plan on Total Yearly Cost
The total-yearly-cost method is simple, and it is the core of this guide. For each plan, estimate two figures.
First, expected total cost: monthly premium multiplied by 12, plus your expected out-of-pocket spending for the year, based on the care you realistically expect to use, such as regular prescriptions, doctor visits, therapy, or a planned procedure. Use last year’s care as a starting point, and adjust for any known changes.
Second, worst-case total cost: monthly premium multiplied by 12, plus the out-of-pocket maximum. This is the most you would pay for covered care in a bad year, and it is the figure that matters most if you cannot afford a large unexpected bill.
Compare plans on both figures: a plan cheapest on expected cost can be most expensive on worst-case cost.
A Worked Example: Low Premium vs High Premium
Take an illustrative example only, with round numbers. Plan A charges $250 a month in premiums, has a $6,000 deductible, 20% coinsurance after the deductible, and an $8,000 out-of-pocket maximum. Plan B charges $450 a month, has a $1,000 deductible, $25 copays for doctor visits, and a $3,500 out-of-pocket maximum.
On premiums alone, Plan A costs $3,000 a year and Plan B costs $5,400 a year, so Plan A looks $2,400 cheaper. On worst-case cost, Plan A costs $3,000 plus $8,000, or $11,000, while Plan B costs $5,400 plus $3,500, or $8,900. In a bad year, Plan B is actually $2,100 cheaper in total, despite the higher premium.
In a healthy year Plan A may still win, paying only premiums plus little care, while in a major-illness year Plan B’s lower maximum protects you. Choose by your health, risk tolerance, and what worst-case bill you could pay without debt.
Networks, Doctors, and Medicines: The Check That Comes Before Price
Total cost only matters for care that is actually covered. Before you compare prices, check three things for each plan: are your current doctors, hospitals, and clinics in the plan’s network? Are your regular prescriptions covered, and at what tier and copay? And are there referral or prior-authorisation rules that could delay care?
Out-of-network care can be far more expensive and may not count toward your out-of-pocket maximum the same way, so a plan excluding your doctor is not truly cheapest. List doctors and medicines first, filter to covering plans, then run the total-cost comparison.
High-Deductible Plans and Health Savings Accounts
High-deductible health plans are often paired with a health savings account, or HSA, which lets you save pre-tax money for medical costs, with tax-free growth and tax-free withdrawals for qualified expenses, subject to eligibility rules and annual limits. An HSA can make a high-deductible plan more attractive, because the money you save can offset the higher deductible, and unused funds can roll over year to year, unlike some other accounts.
An HSA only helps if you are eligible and can actually fund it, so do not choose a high-deductible plan solely because an HSA is available.
For wider insurance planning, health cover sits alongside other protection. Our guide on term life vs whole life insurance explains a different kind of cover, for dependents if you die, while health cover protects against medical bills while you are alive. Both are part of a wider plan, which is why our personal finance guide for beginners treats insurance as one piece of budgeting, saving, and debt payoff, not as a separate purchase.
What to Do If You Use Little Care, or a Lot of Care
If you rarely use care, are healthy, and can cover a deductible from savings, a lower-premium, higher-deductible plan can make sense, especially if HSA-eligible and funded.
If you use care regularly, take regular prescriptions, expect a procedure, or have a chronic condition, a higher-premium, lower-deductible plan with a lower out-of-pocket maximum often makes sense, even though premiums are higher. Your expected total cost is more predictable, and your worst-case cost is capped lower. Our budgeting guide for when everything costs more explains how to fit a fixed premium into a tight monthly plan, and our emergency fund guide explains why a buffer matters even more when medical costs are unpredictable.
Between those extremes, run both cost figures and choose a health insurance plan whose worst case you can afford without debt, even if it is not cheapest in a healthy year.
Common Mistakes When Choosing a Plan
The first mistake is choosing on premium alone, without checking deductible and out-of-pocket maximum. The second is ignoring the network and assuming your doctor is covered. The third is forgetting prescriptions: a medicine that moves to a higher tier can cost far more than the premium saving. The fourth is choosing a high-deductible plan without funding the HSA or having savings to cover the deductible. The fifth is not checking whether preventive care, such as screenings and vaccinations, is covered before the deductible, because that can affect the value of a plan even in a healthy year.
HealthCare.gov provides official plan and enrollment information for US marketplace coverage, and is a useful starting point for checking plan types, deadlines, and eligibility, alongside your employer’s or insurer’s own plan documents.
Frequently Asked Questions
What is the difference between a deductible and an out-of-pocket maximum?
A deductible is what you pay before the plan starts sharing costs. An out-of-pocket maximum is the most you pay in a year for covered care, after which the plan pays 100% of covered costs for the rest of the year.
Is a low-premium plan always cheaper?
No. A low premium can hide a high deductible and a high out-of-pocket maximum. Compare total yearly cost, premium plus expected out-of-pocket spending, and worst-case cost, premium plus out-of-pocket maximum.
How do I estimate my total yearly cost?
Multiply the monthly premium by 12, then add expected out-of-pocket spending based on last year’s care and any known changes. For worst case, add the out-of-pocket maximum instead of expected spending.
Should I choose a high-deductible plan just to get an HSA?
Not on that alone. An HSA helps only if you are eligible, can fund it, and understand the contribution and withdrawal rules. If you cannot cover the deductible, the high-deductible plan remains risky in a bad year.
Disclaimer: This article is for general educational purposes only and does not provide personalised financial, investment, tax, legal, or medical advice. Health insurance terms, networks, premiums, deductibles, and eligibility rules vary by plan, insurer, employer, and jurisdiction, and can change. Check the full plan documents, summary of benefits, and provider network before enrolling.
