Coinsurance in Therapy Billing: What Your Client Pays
Coinsurance in therapy billing is the percentage of the plan’s allowed amount that your client pays for each covered service, after the deductible is met and until the out-of-pocket maximum is reached. The payer pays the rest of the allowed amount, and you collect the client’s share.
Coinsurance in therapy billing: what your client pays
Your client pays their coinsurance percentage times the allowed amount, not times your billed fee. If the plan allows $150 for a session and coinsurance is 20%, the client’s share is $30 once the deductible is met. The payer’s share is the other $120. The HealthCare.gov glossary defines coinsurance the same way: a percentage of the cost of a covered service that you pay after the deductible.
The table below shows coinsurance in therapy billing with round numbers for illustration only. Your clients’ plans will differ.
| Example (illustrative) | Allowed amount | Deductible left | Coinsurance | Client owes | Payer pays |
|---|---|---|---|---|---|
| Deductible not met | $150 | $500 | 20% | $150 | $0 |
| Deductible partly met | $150 | $100 | 20% | $110 ($100 + $10) | $40 |
| Deductible met, 20% plan | $150 | $0 | 20% | $30 | $120 |
| Deductible met, 30% plan | $150 | $0 | 30% | $45 | $105 |
| Out-of-pocket maximum reached | $150 | $0 | 0% owed | $0 | $150 |
The order of operations: allowed amount, deductible, coinsurance, out-of-pocket maximum
Every claim follows the same four steps, in this order. They answer any question about coinsurance in therapy billing, and they let you explain a balance in one minute at the front desk.
- Allowed amount first. This is the most the plan will pay for the service, per the HealthCare.gov definition. Your contract rate usually sets it. See our guide to the allowed amount in therapy billing.
- Deductible second. The client pays allowed amounts until the deductible is met.
- Coinsurance third. After the deductible, the client pays their percentage and the plan pays the rest.
- Out-of-pocket maximum last. Once the client reaches the out-of-pocket maximum, the plan pays 100% of covered in-network services for the rest of the plan year, according to HealthCare.gov.
Our post on coinsurance, copay and deductible compares the three side by side. Flat visit fees work differently, and we cover them in the co-payment guide.
Coinsurance on out-of-network claims
Coinsurance in therapy billing gets harder when you are out of network. On out-of-network claims, coinsurance usually applies to the plan’s allowed amount for that service, which can be lower than your billed fee. The plan may also use a separate deductible and limit. Verify both before you quote a number.
Private payers
HealthCare.gov notes that out-of-network spending does not count toward the out-of-pocket maximum, and neither do charges above the allowed amount. So a client can pay coinsurance all year and still not reach a limit. Our out-of-network billing guide walks through how those claims are paid.
State rules
Whether you may bill a client for the gap between your fee and the allowed amount depends on your contract, the plan type and, in some cases, state law. Check the payer agreement and your state’s rules before you send that bill.
Collect an estimate now, settle the exact amount after the ERA
At check-in, coinsurance in therapy billing means giving a verified estimate. Collect it at the visit, then settle the exact amount when the payer processes the claim. An electronic remittance advice (ERA) is the payer’s electronic explanation of payment, and it shows the client’s actual responsibility. Read it on the ERA guide page if you want the line-by-line view.
Estimates miss for ordinary reasons: a deductible met at another practice, a late-posted claim, or a rate change. When the ERA shows the client paid too much, refund or credit the difference. When it shows too little, send a clear statement. Refund timing can be set by your payer contract and by state law, so confirm yours.
Medicare and Medicaid
Coinsurance in therapy billing works differently for Medicare. Original Medicare Part B generally pays 80% and leaves the client 20% after the annual deductible. On Medicare.gov, the 2026 Part B deductible is $283, and coinsurance is usually 20% of the Medicare-approved amount when the provider accepts that amount as full payment. Medicaid cost sharing varies by state and plan, so use that state’s provider manual rather than a rule of thumb.
What to do Monday morning
Use this list to tighten coinsurance in therapy billing in your own practice.
- Verify benefits before the first visit: deductible left, coinsurance percentage, and out-of-pocket status.
- Write the estimate on the client’s account with the date you checked.
- Collect the estimate at check-in, or run the card on file for telehealth.
- Post the ERA, compare it to the estimate, and refund, credit or bill the difference.
- Give clients a one-line script: “The plan allows $150, you owe 20% of that after your deductible.”
The short version: coinsurance in therapy billing
Coinsurance in therapy billing comes down to this: your client pays a percentage of the allowed amount, after the deductible and until the out-of-pocket maximum. Collect an estimate from verified benefits, then true it up against the ERA. Refund or credit overpayments promptly.
How MCM South helps
MCM South Medical Billing Service, LLC bills mental and behavioral health claims for psychotherapists and psychiatrists, including out-of-network claims. We post payer payments and client responsibility so your balances match the ERA. You decide how and when to collect.
Keep going
Related reading
Want help turning verified benefits into clean claims and fewer surprise balances?
FAQ
When does the client pay coinsurance, before or after the deductible?
After. The client pays allowed amounts until the deductible is met, then pays their coinsurance percentage. Coinsurance and the deductible both count toward the in-network out-of-pocket maximum, per HealthCare.gov.
Do we collect coinsurance at the visit or wait for the ERA?
Most practices collect a verified estimate at the visit and settle the exact amount after the ERA. Waiting for the ERA delays cash and makes the client harder to reach. The estimate is only as good as your verification, so date it.
What if we collected too much coinsurance?
Refund or credit the difference once the ERA shows the real client responsibility. Timing rules come from your payer contract and sometimes state law, so check both. Keep a note of the original estimate for the audit trail.
Is Medicare coinsurance different?
Original Medicare Part B usually leaves 20% of the Medicare-approved amount after the annual deductible. The 2026 Part B deductible is $283 per Medicare.gov. Private plans set their own percentages.
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.
