A psychologist is someone who has studied psychology. This is initially a very scientific education. This person may then have completed several years of training in one or more psychotherapy methods. He or she can then call themselves a psychological psychotherapist. This title is protected and is usually practiced on a freelance basis. If this person has also learned methods that German health insurance companies consider helpful, then you could be offered psychotherapy that can be billed to the health insurance company. The prerequisite for this is a license to practice with the health insurance company and free capacity in the practice.