Quick Answer: A copayment is a flat fee per covered service (e.g., $25 for a 2026 doctor visit), paid at the point of care. Coinsurance is a percentage of the allowed cost (e.g., 20%), usually paid after meeting your deductible. Both count toward your [out-of-pocket maximum](/glossary/out-of-pocket-maximum). Plans with [income-based subsidies](/aca-income-limits) often have lower copays.
Example: How It Works in Practice
Worked example: a 2026 primary care visit with allowed cost $200, before deductible is met. Compare the patient's responsibility under a $25 copay plan versus a 20% coinsurance plan. If you receive a [surprise bill](/medical-bill-analyzer), the analyzer flags coinsurance miscalculations.
Worked example| Plan structure | Patient pays |
|---|
| $25 copay (deductible waived for primary care) | $25 |
| 20% coinsurance (after deductible met) | $40 |
| 20% coinsurance (deductible NOT yet met) | $200 full allowed cost | |
Source: HealthCare.gov 2026 cost-sharing definitions and KFF Employer Health Benefits Survey.
Frequently Asked Questions
When do I pay a copay vs coinsurance in 2026?
Copays usually apply to predictable services like 2026 office visits, generic prescriptions, and specialist visits. Coinsurance applies to bigger-ticket services like hospital stays, imaging, and surgeries, and only kicks in after you meet your deductible. Many plans waive the deductible for primary care copays.
Do copays and coinsurance count toward the 2026 out-of-pocket maximum?
Yes. Both copays and coinsurance accumulate toward your annual out-of-pocket max. The 2026 ACA cap is $9,200 individual and $18,400 family. Once you hit it, the plan pays 100% of in-network covered services for the rest of the year. Premiums do NOT count.
Does Cost-Sharing Reduction (CSR) lower my copay or my coinsurance?
Both. CSR applies to Silver plans for households under 250% of the [Federal Poverty Level](/federal-poverty-level). It reduces copays, coinsurance, AND the deductible. A standard Silver plan might have a $40 copay; a CSR-enhanced Silver plan for the same income can drop it to $15 or less.
Why does my plan charge coinsurance instead of a copay?
Coinsurance shifts more cost variability to the patient. A 20% coinsurance on a $5,000 procedure costs $1,000, much more than a $200 copay. Bronze and lower-premium plans use coinsurance heavily. Gold and Platinum plans lean on flat copays. Check your Summary of Benefits at [HealthCare.gov](https://www.healthcare.gov) before enrolling.
