Module 1 · Lesson 1 of 4
The Four Numbers That Control Every Medical Bill
Only 14% of Americans understand all four basic insurance terms. In this lesson, you’ll join the 14%.
Lesson Progress
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Key Takeaways
Deductible
The entrance fee before insurance starts sharing costs
Copay
The flat fee for routine visits like seeing your doctor
Coinsurance
The percentage split between you and your insurer after the deductible
Out-of-Pocket Maximum
The ceiling on what you pay in a year — your financial safety net
Infographic: Decoding Your Medical Costs
See It In Action: Maria’s $15,000 Surgery
Walk through the math step by step to understand how insurance costs actually work:
Hospital bills $15,000
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Maria’s deductible is $2,000 — she pays this first
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Remaining bill: $13,000
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Maria’s coinsurance is 20% of $13,000 = $2,600
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Maria’s Total Cost
$4,600
Her out-of-pocket maximum is $6,000, so she’s safe. Insurance covers the rest.
Check Your Understanding
Knowledge Check
If your deductible is $2,000 and your coinsurance is 20%, what would you pay on a $15,000 hospital bill (assuming you haven’t met any of your deductible yet)?
Not quite. Remember: you pay the full deductible first ($2,000), then your coinsurance percentage (20%) applies to what’s left ($13,000). $2,000 + $2,600 = $4,600.
Do This Now
Find your Summary of Benefits and Coverage (SBC). Every insurer is legally required to give you one. Look for these four numbers: your deductible, copay, coinsurance rate, and out-of-pocket maximum. Write them down.
Need help understanding your EOB? → Try our EOB Explainer toolAbout This Lesson
This lesson is part of How Your Insurance Actually Works — an evidence-based course designed with clinical expertise by the AnchorWellPress medical team. This content is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult your healthcare provider.