A deductible is the amount of money you pay out of pocket for covered services before your insurance company starts paying.

For example, if you have a health insurance policy with a $1,000 deductible and you receive a medical bill for $2,000, you would pay the first $1,000 and your insurance would cover the remaining $1,000.

Coinsurance is the percentage of a covered expense that an insured person is responsible for paying after meeting their deductible.

In health insurance, coinsurance is expressed as a percentage of the total cost of care. 

For example, if a policy has 20% coinsurance, the insured person is responsible for 20% of the bill, and their health plan pays the remaining 80%.

Coinsurance can also be 0%, meaning the insured person doesn't pay anything, or 100%, meaning they're responsible for the entire bill.

A copay, or copayment, is a fixed amount of money that a patient with health insurance pays for each covered health care service.

Copays are usually paid at the time the service is received and are often printed on the patient's health plan ID card. 

For example, a patient might pay a $20 copay for a doctor's visit and a $10 copay for a prescription. Copays are typically lower for standard doctor visits and higher for emergency room visits. Sometimes, the co-pay for a psychological visit, is different than a medical visit. Copays are usually paid after the patient has met their deductible.

In the instance a patient's copay doesn't cover a psychological evaluation, they might receive a bill for the cost of the the evaluation if they haven't met their deductible. If the patient has met their deductible, they might only pay a percentage of the cost, known as coinsurance, and their health plan would pay the rest.

*The amount of the copay depends on the type of service and the provider, and can vary from $10 to $50.