Health Insurance
If you have supplementary insurance, the treatments performed are declared by yourself with your health care means a bill that inherits after each treatment. I would kindly ask to pay the bill immediately after each treatment costs. This saves you and me extra administrative actions afterwards. If you are not additionally insured, the costs are for your own account.
Important for you is to advance the initial consultation to check your policy to see how many treatments will be reimbursed annually from your insurer.