If you have a Health Savings Account, or a Medical Savings Account then your treatments are covered. There will be no need for a certificate of medical necessity. just book your appointment and come in.
Workers Compensation and auto insurance are evaluated on a case-by-case basis and in some situations may be covered. A prescription will be necessary.
Most health insurances do not as yet cover these kinds of treatments. However some insurances may provide a reimbursement, check with your provider. Also depending on your tax bracket, you may be able to deduct the cost of your treatments as a medical expense.