This is any doctor who has not concluded a contract with any of the health insurance. After you paid the fee to the doctor, you have the opportunity to get a part of the amount back from your insurance.
Unfortunately, most often, insurance companies do not pay the full amount of the fee. Basically you get 80% of the amount that the insurance company would pay to the doctor with whom it has a contract.
The amount paid by insurance to the doctor under the contract depends on the services provided and may not always be the same.
Additionally, the amount also depends on the type of insurance company, which varies depending on the tariffs of the contract, which also varies depending on the region or region of the country.