The Five Main Cost Categories
Premium
Your premium is what you pay each month (or sometimes each year) to have health coverage. You owe it whether or not you use any healthcare. Think of it like a membership fee: without it, you have no insurance.
Deductible
The deductible is the amount you must pay out of your own pocket before your plan starts paying its share. Once you've paid your deductible, your plan kicks in to help with the remaining costs.
Example: Suppose your deductible is $1,000 and you visit the doctor. If the visit costs $150, you pay all of it. If you have three more visits totaling $900, you pay all of those too—now you've paid $1,050 total, which meets your $1,000 deductible. On your next claim, the plan starts sharing the cost with you.
Copay
A copay (or copayment) is a fixed amount you pay for a specific service. It's the same every time, regardless of what the actual service costs.
Example: Your plan might charge a $30 copay for a primary-care doctor visit, a $50 copay for a specialist visit, and a $5 copay for a generic prescription. You pay exactly that amount; your plan pays the rest of the bill (assuming the provider is in-network).
Coinsurance
Coinsurance is a percentage of the cost that you and your plan split. Your plan documents will specify your share (commonly 10%, 20%, or 30%), and the plan covers the rest.
Example: Your plan has 20% coinsurance for outpatient surgery. Suppose the surgery is billed at $5,000. Once your deductible is met, you pay 20% of that ($1,000), and your plan pays 80% ($4,000).
Out-of-Pocket Maximum
Your out-of-pocket maximum (or out-of-pocket limit) is an annual cap on how much you'll spend on your own. Once you hit this limit, your plan pays 100% of all covered services for the rest of that calendar year.
Example: Your out-of-pocket maximum is $5,000. Over the course of a year, between deductibles, copays, and coinsurance, you've paid $5,000. Any medical bills after that point are covered entirely by your plan—you pay $0.
How They Work Together Over a Year
January–March: You pay your $200 premiums. You see your primary doctor ($30 copay), get a lab test billed at $300 (you pay all of it toward your deductible), and see a specialist whose bill is $1,500 (you pay 20%, which is $300, also counting toward your deductible). So far, you've paid $630 out of pocket; your $1,500 deductible is now met.
April–August: You have more specialist visits. Each time, your plan covers 80% and you pay 20% coinsurance. Over these months, you pay $3,000 in coinsurance. Your total out-of-pocket spending is now $630 + $3,000 = $3,630.
September: You need emergency surgery billed at $6,000. At 20% coinsurance, you'd owe $1,200. But $1,200 + $3,630 = $4,830, which is still under your $7,500 out-of-pocket maximum. You pay the $1,200.
October–December: You have a hospitalization. The bill is $8,000, and your share would be $1,600. But $1,200 + $1,600 = $2,800, which exceeds your $7,500 out-of-pocket max by $1,300. So you pay only $1,300 (bringing your total to $7,500). Your plan pays the remaining $6,700. For the rest of the year, you pay $0 out of pocket.
Medicare-Specific Costs
Part A and Part B
Medicare has separate costs for different types of coverage:
- Part A (Hospital Insurance) covers hospital stays, skilled nursing, hospice, and some home care. Most people don't pay a premium, but they face a deductible and coinsurance for hospital stays and extended stays in a skilled nursing facility.
- Part B (Medical Insurance) covers doctor visits, outpatient services, and lab work. It has a monthly premium and an annual deductible, then you typically pay 20% coinsurance for most services.
Part B Premium and IRMAA
Your Part B premium is based on your income. Higher earners pay more through a surcharge called IRMAA (Income-Related Monthly Adjustment Amount). The income thresholds and surcharge amounts are set annually by CMS.
For current Part B premiums and IRMAA thresholds, visit Medicare.gov.
Part C (Medicare Advantage)
Medicare Advantage plans are offered by private insurers under contract with Medicare. They usually have lower or zero premiums than Original Medicare but use copays and coinsurance. Each plan's costs vary.
Part D (Prescription Drug Coverage)
Part D has four distinct cost phases:
- Deductible phase: You pay the full cost of prescriptions until you reach your plan's deductible.
- Initial coverage phase: After your deductible, you pay a copay or coinsurance; your plan covers the rest.
- Coverage gap (the "donut hole"): Once your total drug costs reach a certain amount, you enter the donut hole. You pay a higher percentage of your drug costs, though catastrophic coverage limits your out-of-pocket spending.
- Catastrophic coverage phase: Once your out-of-pocket costs hit the annual limit, you pay a small copay or coinsurance, and your plan covers the rest.
Part D rules change from year to year. For current phases and thresholds, see Medicare.gov.
ACA Marketplace Subsidies
If you enroll in a health plan through the ACA Marketplace (also called the Health Insurance Marketplace), you may qualify for financial help based on your income:
- Premium Tax Credits reduce your monthly premium. The insurer receives the credit and lowers what you pay each month.
- Cost-Sharing Reductions (CSRs) lower your deductible, copays, and coinsurance if you choose a Silver-level plan and qualify based on income.
These subsidies are income-based and change annually. Your actual payment depends on your household income relative to the federal poverty level. For current income limits and to estimate your subsidy, visit HealthCare.gov.
Medicaid
Medicaid is a joint state–federal program with widely varying benefits and costs by state. Generally, Medicaid has little or no premium, deductible, or copay for eligible members. Some states charge small copays for certain services, but cost-sharing is typically much lower than private insurance or Medicare.
To learn what Medicaid costs in your state, visit your state's Medicaid website through Medicaid.gov.
Cost Terms at a Glance
| Term | What It Means | When You Pay It |
|---|---|---|
| Premium | Monthly (or annual) membership fee for coverage | Every month, regardless of whether you use care |
| Deductible | Amount you must pay before your plan helps | Before the plan starts sharing costs; resets each year |
| Copay | Fixed amount for a specific service | At the time you get the service (or after deductible, depending on plan) |
| Coinsurance | Your percentage share of the cost | After deductible is met; you and plan split the bill |
| Out-of-Pocket Maximum | Annual cap on your total out-of-pocket costs | When reached, plan pays 100% for rest of year |
| IRMAA | Medicare income-related surcharge on Part B | Added to your Part B premium if income exceeds threshold |
| Premium Tax Credit | Marketplace subsidy that reduces your premium | Paid directly to your insurer; lowers your monthly bill |
| Cost-Sharing Reduction | Marketplace subsidy that lowers deductibles and copays | Lowers what you owe when you get care |
Key Takeaways
- Your premium is what you pay to have coverage; other costs apply when you use care.
- Your deductible is what you pay first; once it's met, your plan begins to share costs.
- Your out-of-pocket maximum sets an annual limit on your spending; the plan covers 100% after you hit it.
- Different programs—Original Medicare, Medicare Advantage, Marketplace plans, and Medicaid—have different cost structures.
- Income-based help is available for Medicare (IRMAA adjustments) and Marketplace plans (tax credits and cost-sharing reductions).