The first patient has to pay $30 as a copay at the point of admission. On the other hand, the second patient is under the same physician but needs to pay 20% of the approved cost of service. Both the patients have insurance, but their payments are different, which impacts the estimates of the amount of charges, payment collection process and the claim processing procedures of the healthcare facilities.
Knowing the difference between copay and coinsurance, healthcare providers can identify the exact amount that their patients have to pay. Copay is a fixed amount, while coinsurance calls for some additional information from the patient.
Failure to collect the correct amount may result in uncollected amounts in the accounts receivable, refunds, and unnecessary billing disputes.
This article describes the difference between copay and coinsurance and how to calculate the amount that has to be paid by the patients.
What Is the Difference Between Copay and Coinsurance?
The fundamental distinction between copay and coinsurance is in the way the health insurance plan determines what is owed by the patient on their medical costs.
The copay is a flat dollar cost that a patient has to pay on a covered health care service. Coinsurance is a certain percentage of the covered amount owed by a patient, typically after the deductible has been met.
For instance, a patient will be responsible for a $25 copay on a visit to a general practitioner or 20% coinsurance on an outpatient surgery.
Copay vs Coinsurance: Quick Comparison
| Feature | Copay | Coinsurance |
| Payment structure | Fixed dollar amount | Percentage of allowed charges |
| Example | $30 office visit | 20% of a $200 allowed amount |
| Patient payment | $30 | $40 |
| When collected | Often at check-in or checkout | Often estimated before service and finalized after claim processing |
| Deductible impact | Depends on plan benefits | Generally applies after the deductible |
| Predictability | Usually easier to determine | Varies with service cost and benefits |
| Common application | Office visits, specialist visits, prescriptions | Procedures, imaging, outpatient services, hospital care |
The distinction matters most when a practice calculates patient responsibility before receiving the insurer’s final payment determination.
What Is a Copay in Health Insurance?
Copayment, known as copay, is a fixed cost set by the insurance company for a particular medical service.
This cost is set by the insurance company through the benefit plan of the patient. For instance, the cost of a primary doctor visit may be $20 while a specialist visit may be $50.
Copays may apply to:
- Primary care and specialist appointments
- Urgent care visits
- Prescription medications
- Emergency department visits
- Certain outpatient services
Yet, procedures must never take for granted that every service provided during one appointment is covered by the same copay.
For example, the patient who has a specialist copay of $35 can also undergo a test. This test will have its own deductible or coinsurance requirement depending on the coverage.
How Does a Copay Work in Medical Billing?
Consider a physician’s office with the following hypothetical payment arrangement:
| Billing detail | Amount |
| Provider’s submitted charge | $180 |
| Insurance allowed amount | $120 |
| Patient copay | $30 |
| Insurance payment | $90 |
| Contractual adjustment | $60 |
Assume that the patient has met his/her deductible and the copay of $30 is all that the plan pays toward the service.
The practice receives $30 from the patient, the insurer pays $90, and the difference of $60 constitutes the contractual adjustment.
The $60 adjustment is not an additional patient balance.
Exceeding the allowed amount for patient responsibility in in-network providers constitutes a violation of the terms set forth in the payer contract.
Considerations when Billing for Copayments: The employee needs to check whether the copayment is applicable to that service and if the patient has met the deductible or the out-of-pocket maximum.
What Is Coinsurance in Medical Billing?
Coinsurance is the percentage of the allowed amount of a covered service assigned to the patient.
It contrasts with the copayment since the coinsurance varies depending on the allowed amount of care.
For instance, a patient whose coinsurance is 20 percent will have to pay 20 percent of the allowed amount. Therefore, a patient paying coinsurance of 20 percent would need to pay $40 out of an allowed amount of $200, after having paid the deductible.
How to Calculate Coinsurance
Coinsurance calculation
Insurance allowed amount ($)
Patient coinsurance rate
20%
Estimated patient coinsurance
$100.00
Assuming that the applicable deductible requirement has been fulfilled, and there are no other limitations on cost sharing.
With an allowed amount of $500 and 20% coinsurance, the patient will pay $100, and the insurer will pay $400.
Physicians must base their coinsurance calculations on the insurer’s allowed amount and not the practice fee.
Why Coinsurance Creates Collection Challenges
A practice may know the patient’s coinsurance percentage before treatment but not the exact final balance.
Subject to the assumption that the deductible requirement has been satisfied and there are no other limitations on the cost-sharing requirement.
For an allowable charge of $500 with 20% coinsurance, the patient will cover $100 while the insurer pays $400.
The coinsurance determination should be based on the insurer’s allowable charge and not the physician’s charge..
How Do Copay, Coinsurance, and Deductibles Work Together?
Deductibles introduce another variable into patient billing.
A deductible is the amount a patient must pay for covered healthcare services subject to that deductible before the insurance plan begins sharing those costs.
A plan may apply a copay to certain office visits without requiring the patient to meet the deductible first. Other services may require deductible payments followed by coinsurance.
Example: Deductible and Coinsurance on the Same Claim
Suppose a patient receives a covered outpatient procedure with these benefits:
| Billing component | Amount |
| Insurance allowed amount | $1,000 |
| Remaining deductible | $300 |
| Coinsurance after deductible | 20% |
| Deductible responsibility | $300 |
| Coinsurance on remaining $700 | $140 |
| Total patient responsibility | $440 |
| Insurance payment | $560 |
The practice first applies the $300 remaining deductible.
The remaining $700 is subject to 20% coinsurance, thus another $140 is charged from the patient.
So the patient is required to pay $440, instead of 20% of the total $1,000 charge.
The above calculations assume that the service is covered, no copay is required, and the patient’s out-of-pocket maximum does not affect this calculation.
One common error is that providers will calculate coinsurance on the entire allowed amount without considering the patient’s obligation for the deductible portion.
What Happens When a Patient Reaches the Out-of-Pocket Limit?
Comparing Copay and Coinsurance: Which Payment Option Is Superior?
It cannot be said that one option is always superior to the other. It depends on the health care expenses and use, insurance coverage, premiums, deductibles, and OOP maximum that applies to that particular individual.
If the individual will require multiple trips to the outpatient department, then a clear pattern of copay may be beneficial. A lower coinsurance rate may have some benefits in case of a procedure that costs a lot, but the overall scheme counts more than one percentage point.
The following table shows possible options in case of $600 covered charge:
What Happens After the Out-of-Pocket Maximum?
The out-of-pocket maximum limits qualifying patient cost-sharing expenses during the plan year.
Once a patient reaches the applicable limit, the health plan generally pays 100% of the allowed cost of covered in-network benefits for the rest of that plan year.
Deductibles, copayments, and coinsurance generally count toward this limit, subject to the plan’s rules.
Premiums, noncovered services, and certain out-of-network charges do not count toward the applicable in-network limit.
Providers should check the patient’s remaining out-of-pocket obligation instead of automatically collecting the usual copayment or coinsurance.
Copay vs Coinsurance: Which Is Better?
Neither payment structure is universally better. The financial impact depends on the patient’s healthcare usage, treatment costs, coverage, premiums, deductible, and out-of-pocket maximum.
For someone who needs regular outpatient visits, predictable copays may simplify budgeting. A plan with lower coinsurance may offer advantages for expensive procedures, but the broader benefit design matters more than one percentage.
Consider these hypothetical options for a covered service with a $600 allowed amount, assuming all applicable deductibles are met:
| Plan arrangement | Patient payment |
| Fixed $40 copay | $40 |
| 10% coinsurance | $60 |
| 20% coinsurance | $120 |
| 30% coinsurance | $180 |
In this isolated example, the $40 copay produces the lowest patient payment. It does not establish which insurance plan is better overall.
It is more convenient for the provider to predict and collect copayments. Coinsurance demands a closer examination of the insurance benefits and could cause higher amounts on the patients’ statements after the claims process.
The crucial issue here is not what system is better but rather if the billing department is correctly using the insurance benefits of the patient.
How Copay and Coinsurance Affect Medical Practice Revenue
Patient cost sharing directly influences a practice’s collection workflow. However, the cost of insurance coverage does not cover the entire price of certain medical services; there are other amounts that must be taken into account.
There are several important things to consider:
1. Incorrect Prepaid Amounts
The receptionist can ask the patient to pay a copay that is stated on the insurance card for any type of medical service. However, the patient needs to pay his deductible and coinsurance amount for another procedure.
Collecting only $25 leaves the practice with additional patient responsibility to recover after claim processing.
The reverse creates problems as well. Over collecting can require refunds, account corrections, and extra communication with patients.
2. Outstanding Patient Balances
Coinsurance payments are usually unclear until the claims are processed by the payers.
When a practice fails to estimate patient responsibility or set up a payment plan, such balances end up in the practice’s patient accounts receivable.
For instance, a practice estimates coinsurance payment of $75 for a certain procedure, but the processed claim shows that the patient owes $110.
The extra $35 has to be collected either by billing or through a payment agreement.
3. Incorrect Contractual Adjustments
A provider charges $400 for a service, but the insurance company allows $250.
The practice must apply the appropriate contractual adjustment and calculate patient responsibility using the adjudicated benefit information.
If the patient’s coinsurance is 20% and no deductible applies, the patient owes $50, not $80.
Calculating coinsurance against the full submitted charge can result in overbilling.
How to Verify and Collect Copay and Coinsurance Correctly
The consistency of a workflow process enables practices to charge the right amount without having to make assumptions.
- Confirm insurance eligibility prior to your visit. Check eligibility, insurance, plan, and network affiliation. Insurance eligibility doesn’t necessarily mean that payments will be made.
- Evaluate the patient’s insurance benefits for services rendered. Know the copay, coinsurance, deductible, and out-of-pocket amount.
- State the amount that needs to be paid prior to billing. Instruct patients on whether the amount due is a standard copay or an estimated charge which will be revised later based on insurance
- Claims should be submitted with correct codes. Submit the proper CPT or HCPCS codes, along with diagnosis and any additional claim details based on the service and the insurance.
Adjudication of the claim needs to be done. Compare the EOB/ERA, record the payment and any other adjustments made by the insurance, deduct what has been received from the patient, and balance the difference.
This will ensure you do not collect less than or more than the amount due, and also avoid any patient account issues.
This process reduces the risk of collecting too little, charging too much, or leaving patient accounts unresolved.
Common Copay and Coinsurance Billing Errors
Even practices with established billing procedures can encounter recurring problems involving patient cost sharing.
| Billing error | Recommended correction |
| Collecting a specialist copay for a service subject to coinsurance | Verify benefits for the actual service category |
| Calculating coinsurance using billed charges | Use the applicable payer allowed amount |
| Ignoring an unmet deductible | Include deductible responsibility in the estimate |
| Charging the standard copay after the applicable out-of-pocket maximum has been met | Confirm current cost-sharing balances |
| Billing patients for contractual adjustments | Reconcile allowed amounts and payer adjustments |
| Failing to credit upfront collections | Apply the patient payment before generating the final statement |
| Treating an estimated balance as final | Reconcile against the processed claim |
Practices should also distinguish claim denials from valid patient cost-sharing obligations.
It is important to note that a deduction or coinsurance attributed to the insured is not an automatic denial since the insurance company may have processed the claim accurately according to their coverage plan and assigned some of the amount to the insured.
This is relevant to account classification and determining whether to correct the claim with the insurance company or make patient collections.
Considerations for Billing and Coding of Providers
- The copayment and coinsurance are design terms used for benefits and not as clinical services. They do not have individual CPT or ICD-10-CM codes selected by providers to compute the patient’s share.
- The billing procedure is as follows: CPT and HCPCS codes describe procedures, professional services, and any supplies associated with the service.
- ICD-10-CM codes list the documentation diagnoses, medical conditions, and reasons for services.
- Modifiers and place-of-service code, where needed, provides extra information on the claim. The payer’s benefit plan determines the patient cost-sharing after the claim is processed.
For example, an established patient E/M service and a separately reportable procedure performed during the same encounter may have different cost-sharing treatment. The payer’s benefit design and applicable coding rules determine how the claim is processed.
Providers should never change service codes simply to obtain a lower copayment or different coinsurance rate.
Medicare Copay and Coinsurance Considerations
Original Medicare Part B generally requires beneficiaries to pay 20% of the Medicare-approved amount for many covered services after meeting the applicable Part B deductible. Exceptions apply, including certain preventive services.
Medicare Advantage plans may use fixed copayments, coinsurance, or different cost-sharing arrangements depending on the plan and service.
Providers also need to consider Medicare assignment, supplemental insurance, Medicaid secondary coverage, and applicable beneficiary-billing restrictions.
CMS explains that physicians accepting Medicare assignment agree to accept the Medicare-approved amount as payment in full, subject to permitted deductible and cost-sharing amounts.
What About Out-of-Network Services?
Out-of-network cost sharing may differ from in-network benefits. Some plans impose higher coinsurance rates, separate deductibles, or additional financial responsibilities.
However, providers cannot assume that out-of-network status automatically permits balance billing.
The federal No Surprises Act restricts surprise billing for many emergency services and certain non-emergency services involving out-of-network providers at in-network facilities. Applicable state protections may also affect patient charges.
Before issuing an out-of-network patient statement, practices should verify whether federal or state billing protections apply.
How Can Medical Practices Improve Patient Collections?
The best approach combines accurate insurance verification with consistent communication and payment reconciliation.
Verify benefits at the service level. Checking active coverage is not enough. Billing staff should confirm the actual cost-sharing rules for the planned encounter or procedure.
Provide realistic estimates. Use known contracted rates, current benefit data, and expected services. Clearly identify amounts that may change after adjudication.
Collect permitted amounts consistently. Establish payment procedures that comply with payer contracts, applicable laws, and financial hardship policies.
Reconcile patient balances promptly. Review remittance information before sending statements. Investigate unusual responsibility amounts, duplicate payments, and missed contractual adjustments.
Track patient accounts receivable separately from insurance A/R. This helps billing managers distinguish insurer payment delays from outstanding patient obligations and direct follow-up appropriately.
A sound collection process does not depend on requesting larger payments at check-in. It depends on determining what the patient actually owes and managing that balance accurately.
Frequently Asked Questions About Copay vs Coinsurance
1. Is copay the same as coinsurance?
No. A copay is a fixed payment for a covered healthcare service, while coinsurance is a percentage of the allowed amount. Both represent patient cost sharing, but insurance plans calculate them differently.
2. Do patients pay both copay and coinsurance?
Sometimes. A plan may apply different cost-sharing requirements to separate services during the same encounter. Certain benefit designs may also require more than one type of cost sharing. Providers should verify the specific plan rather than automatically charging both for the same service.
3. Is a 20% coinsurance better than a $50 copay?
It depends on the allowed service cost. For a $200 allowed amount, 20% coinsurance equals $40, which is less than a $50 copay. For a $500 allowed amount, the same coinsurance equals $100. Deductibles and other plan provisions can change the comparison.
4. Does coinsurance apply before the deductible?
Generally, coinsurance applies after the patient meets the applicable deductible. If the deductible remains partially unmet, the patient may owe the remaining deductible plus coinsurance on the eligible amount beyond it.
5. Can a provider collect coinsurance before submitting a claim?
Providers may collect an estimated coinsurance amount before claim adjudication when permitted by payer contracts and applicable law. They should explain that the amount is an estimate and reconcile it with the final determination to avoid overbilling or underbilling.
6. Do copays and coinsurance count toward the out-of-pocket maximum?
Generally, qualifying copayments and coinsurance for covered in-network services count toward the plan’s out-of-pocket maximum. Certain charges and services may be excluded. Providers should confirm the applicable plan rules.
7. Why did insurance apply coinsurance instead of my copay?
The service may fall under a different benefit category, such as diagnostic testing, outpatient surgery, or specialist procedures. The patient may also have an unmet deductible. Billing staff should review the EOB and service-specific benefit information before assuming the payer made an error.
8. Does Medicare use copays or coinsurance?
Original Medicare commonly uses coinsurance for covered Part B services, while Medicare Advantage plans may apply copayments or coinsurance depending on the benefit design. The amount also depends on the particular service and any applicable secondary coverage.
Conclusion
The distinction between copay and coinsurance determines how practices calculate and collect patient payments. Copays provide a predetermined amount for covered services, while coinsurance changes according to allowed charges and applicable insurance benefits.
For medical practices, the priority is to verify cost-sharing requirements before treatment, calculate estimates correctly, and reconcile patient balances after claims are processed.
Accurate collection practices help reduce billing corrections, limit outstanding patient balances, and give patients clearer information about their financial responsibilities.
Are Patient Cost-Sharing Errors Affecting Your Collections?
Incorrect copays, unverified coinsurance, and unresolved patient balances can complicate your practice’s revenue cycle. Professional medical billing support can help your team verify benefits, calculate patient responsibility, reconcile payments, and manage outstanding balances more effectively.
Strengthen your billing process with medical billing services designed around accurate claims and consistent patient collections.