Coinsurance vs Copay vs Deductible: 3 Easy Differences
Coinsurance vs copay vs deductible is really three ways a plan splits the cost of a visit with the patient: the deductible is what the patient pays first, the copay is a flat dollar amount, and coinsurance is a percentage. Which one applies decides what your practice collects at the visit and what the payer sends later.
Coinsurance vs copay vs deductible at a glance
A deductible is the amount a patient pays for covered care before the plan starts paying its share. A copay is a fixed dollar amount for a visit. Coinsurance is a percentage of the cost the patient pays after the deductible is met. HealthCare.gov’s glossary uses the same basic definitions for deductible, copayment and coinsurance.
Difference 1: when each one applies
In the coinsurance vs copay vs deductible sequence, the deductible comes first, once per plan year. Coinsurance usually starts after the deductible is met. A copay is charged per visit, and the plan decides whether it applies before or after the deductible. That last point is why you check the plan for every new patient instead of assuming.
Difference 2: a flat amount versus a share
A copay does not change with your fee. A $25 copay is $25 whether the allowed amount is $120 or $180. Coinsurance moves with the allowed amount, which is the most the plan will pay for the service under its contract. Twenty percent of $150 is $30, and twenty percent of $180 is $36. The deductible is a running balance that each session reduces until it reaches zero.
Difference 3: where you see each on the remittance
Plans report all three on the explanation of benefits (EOB) and the electronic remittance advice (ERA), the payment detail the payer sends back. On the ERA, the standard claim adjustment reason codes are 1 for the deductible amount, 2 for the coinsurance amount and 3 for the co-payment amount. Read your remittance for these lines before you bill the patient. Our guide to reading CARC and RARC codes walks through the rest.
Worked example: one $150 session
Here is how the coinsurance vs copay vs deductible split plays out on the same session under different plan states. These are round, illustrative numbers for teaching. They are not MCM South data and not any payer’s rates. Assume an allowed amount of $150, a $25 copay on one plan, and 20% coinsurance on another.
| Plan state | Patient owes | Payer pays | What it means at the visit |
|---|---|---|---|
| Copay plan, $25 copay | $25 | $125 | Collect $25 at check-in |
| Deductible not met ($1,000 left) | $150 | $0 | Whole allowed amount counts toward the deductible |
| Deductible nearly met ($100 left), 20% coinsurance | $110 ($100 + 20% of $50) | $40 | The session straddles the deductible |
| Deductible met, 20% coinsurance | $30 | $120 | Collect about 20% of the allowed amount |
| Out-of-pocket maximum met | $0 | $150 | Nothing to collect for covered care |
Under most in-network contracts you cannot bill the patient the gap between your fee and the allowed amount, so check your payer contract. Our post on in-network vs out-of-network credentialing explains why.
The out-of-pocket maximum caps the year
The out-of-pocket maximum is the most a patient pays in a plan year for covered, in-network care. Deductibles, copays and coinsurance count toward it. Premiums, services the plan does not cover, and out-of-network care do not, according to HealthCare.gov. Once a patient hits it, the plan covers covered in-network services at 100%, so your patient share drops to zero for the rest of the year. Checked 10/24/26.
Private payers
Each plan sets its own deductible, copay, coinsurance and cap. For ACA Marketplace plans, HealthCare.gov lists a 2026 limit of $10,600 for an individual and $21,200 for a family. Employer and other plans vary, so verify each patient’s numbers.
Medicare and Medicaid
Medicare is different from a commercial plan. For 2026, medicare.gov lists a Part B deductible of $283. After that, the patient usually owes 20% of the Medicare-approved amount, assuming you accept it as payment in full. Medicaid cost-sharing is set by each state, so check your state Medicaid site rather than applying a rule from another state.
What is the difference between a copay and coinsurance?
A copay is a fixed dollar amount the patient pays per visit, such as $25. Coinsurance is a percentage of the allowed amount, such as 20%, usually charged after the deductible is met. A copay stays the same when your fee changes. Coinsurance rises and falls with it.
What to collect at the visit, and how to explain it
Collect what verification tells you is the patient’s share, then correct it when the remittance arrives. Run your patient benefit verification before the first session, so the number you quote is based on the plan and not on a guess. Put your collection rules in a written financial policy, and ask the payer or counsel if you are unsure what your contract allows.
- At intake: explain coinsurance vs copay vs deductible in one plain sentence each, then give the patient their deductible, copay or coinsurance and say it is an estimate until the claim is paid.
- At check-in or telehealth: collect the copay or estimated share before or at the session, with a card on file or a payment link.
- After the ERA: compare what you collected with what the payer assigned to the patient, then refund or bill the difference.
- Each January: ask every patient again. Many plans reset the deductible at the start of the plan year, which is not always January 1.
Psychiatrists: verify medication-management evaluation and management (E/M) visits separately from psychotherapy add-on codes, because a plan may cost-share them differently.
Mistakes to avoid
- Quoting a copay when the plan applies the deductible first.
- Forgetting that sessions reduce the deductible balance as they go.
- Billing the patient before the remittance shows their share.
- Telling patients their out-of-pocket maximum includes out-of-network care.
The short version: coinsurance vs copay vs deductible
Coinsurance vs copay vs deductible comes down to order and type: the deductible is paid first, the copay is a flat amount, and coinsurance is a percentage of the allowed amount. The out-of-pocket maximum caps the year. Verify before the visit, collect the estimated share, and true it up against the remittance.
How MCM South helps
MCM South Medical Billing Service, LLC bills for psychotherapists and psychiatrists, including out-of-network claims. We read the remittance, post the patient share, and flag when what a patient paid does not match what the payer assigned. You keep control of your financial policy.
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FAQ
Which comes first, the deductible or the copay?
It depends on the plan. Many plans apply the deductible first and charge coinsurance afterward, while others charge a flat copay for therapy visits from the first session. Verify the specific plan for each patient.
Does the copay count toward the deductible?
Not always. Some plans count copays toward the deductible and some do not, though copays generally count toward the out-of-pocket maximum for in-network care. Confirm both when you verify benefits.
Can a patient owe more than the out-of-pocket maximum?
Not for covered in-network care. Premiums, services the plan does not cover, and out-of-network care do not count toward the cap, so a patient can still owe those amounts.
How do I handle a deductible that resets in January?
Re-verify every active patient at the start of the plan year. Expect the first sessions of the year to be collected at the full allowed amount until the new deductible is met.
Where MCM South works
MCM South Medical Billing Service, LLC works with psychotherapists and psychiatrists in our ten currently served states: Georgia, Massachusetts, Connecticut, Texas, Florida, New York, Colorado, Tennessee, North Carolina and Illinois. We serve solo and medium-size practices that bill mental and behavioral health. Founder Michael Williams has worked with insurance payers in all 50 states. Browse the state and regional billing guides for rules that vary by state, or see our billing services.
This post is operational guidance for billing, not legal advice. Rules change, so confirm with the payer or your counsel.
