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Health insurance basics: premiums, deductibles and the worst-case number
Premium, deductible, copay, network, out-of-pocket max — decode the six terms, then compare plans on the number that survives a bad year.
Health insurance is the one product most people are forced to buy without ever learning what it says. The paperwork is long, the words are precise, and the precision is exactly where money is lost: two plans with similar monthly prices can differ by thousands in a bad year. This guide decodes the handful of terms that decide everything, then gives you the comparison method that actually works.
The six terms that decide your costs
- Premium — what the plan costs per month, paid whether you use care or not. This is the only cost that is certain.
- Deductible — what you pay out of pocket each year before the insurer starts sharing costs. A ₦0-premium-feel cheap plan with a huge deductible is not cheap; it is a bet that you stay healthy.
- Copay / coinsurance — your share after the deductible: a fixed amount per visit, or a percentage (coinsurance) of the bill. An 80/20 split means you carry 20% of every covered cost.
- Out-of-pocket maximum — the ceiling on your year. Once your deductibles and shares reach it, covered care costs you nothing more. This number, not the premium, is the honest measure of your worst case.
- Network — the providers the plan has rates with. Care outside the network can cost dramatically more or not be covered at all; checking that your doctor and nearest good hospital are in-network beats every other comparison.
- Covered services and exclusions — what the plan actually pays for: prescriptions, maternity, mental health, physio, emergencies. The exclusions list is where surprises live.
The premium–deductible trade-off, honestly
Plans sit on a spectrum: high premium / low deductible suits predictable, ongoing care (chronic conditions, regular prescriptions, a pregnancy planned); low premium / high deductible suits the rarely-sick, and pairs naturally with a health savings arrangement where one exists. The arithmetic is a break-even: estimate your likely year of care, then add premiums + expected out-of-pocket for each plan. The cheaper plan on paper flips to expensive somewhere around two or three significant events a year — and the emergency fund is what stands between a deductible and a credit card.
The same logic, different machinery
The structure is universal; the plumbing is national. In the US, coverage comes via employers, marketplace plans (healthcare.gov runs the federal exchange), Medicaid by income, and Medicare by age. The UK runs the NHS as residence-based care with private insurance largely for speed and elective comfort. In Nigeria, the NHIA scheme provides a social insurance backbone while private HMOs serve employers and individuals — and wherever you are, the checks are identical: confirm what is covered, the claims process, the network near you, and the exclusions in writing. Anyone anywhere selling a "covers everything" health plan without an exclusions document is selling a slogan.
The four expensive mistakes
- Comparing premiums only. The worst-case column (out-of-pocket maximum) decides bad years; premiums decide good ones. Compare both.
- Assuming continuity. Changing jobs, countries or plans can reset deductibles and change networks mid-year — check before the treatment, not after the bill.
- Skipping the fine print on pre-existing conditions and waiting periods, which vary sharply between markets and products.
- Underinsuring to save. Insurance exists for the catastrophic case; the small stuff belongs in the budget, per the budgeting guide. A plan you cannot afford to use is decoration.
Health insurance rewards the same discipline as every other page on this desk: know the worst case before the good case, read what is excluded, and never let a monthly number hide an annual one. The life insurance guide covers the sibling product — same logic, longer horizon.
Sources and further reading
Links were reviewed 2026-09-25. Regulatory permissions, firm status and product terms can change; use the current official register before acting.
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