The “Gebührenordnung für Ärzte” (GOÄ, statutory scale of fees for physicians) is responsible for regulating the prices of all medical services outside statutory health care in Germany. An invoice in accordance with the regulations of the GOÄ is sent to uninsured patients, patients in a private health insurance plans and patients who use individual health services (IGeL) outside their statutory insurance. Cenata provides invoices in accordance with GOÄ for all patients.