Psychotherapists who are licensed by the state of California have completed a professional training program, undergone a period of supervised experience, and passed a formal examination in a specific profession. Those who have not yet obtained licensure may practice psychotherapy under the supervision of a licensed professional. Therapists from all professional backgrounds may use a variety of techniques and have a variety of theoretical approaches. The nature of the professional degree or license does not determine the skill level, theoretical approach, or kinds of techniques a therapist might use. Below is a description of the different types of credentials a psychotherapist may have.

Licensed Clinical Social Worker (LCSW) - has completed a two-year master’s degree (M.S.W.) or higher in social work, 3,200 hours of supervised experience, and passed written and oral social work examinations. They may be trained in a variety of therapeutic techniques and approaches and may perform social service functions other than psychotherapy. The license number issued by the Board of Behavioral Sciences will contain LCS followed by five to six digits.

Associate Clinical Social Worker (ASW) – has completed a two-year master’s (M.S.W) degree  or higher social work, and is in the process of obtaining the required 3,200 hours of supervised experience before taking the licensing examinations. A registered associate can be supervised by either a licensed clinical social worker, a licensed marriage and family therapist, a licensed psychologist, or a board certified psychiatrist. The associate registration number issued by the Board of Behavioral Sciences will contain the letters ASW followed by five digits.
 
Licensed Marriage and Family Therapist (MFT) - has completed a two-year master’s degree (M.A.) or higher in psychology or marriage and family therapy, 3,000 hours of supervised experience, and passed written and oral marriage and family therapist examinations. While their training specializes in relationships, they are also qualified as individual therapists and may  practice a variety of therapeutic techniques and approaches. The license number issued by the Board of Behavioral Sciences will contain the letters MFC followed by four to five digits. Note: Formerly known as Marriage, Family, and Child Counselor (MFCC).

Registered Marriage and Family Therapist Intern (MFT Intern) - has completed a two-year master’s degree (M.A..) or higher in psychology or marriage and family therapy, and is in the process of obtaining the required 3,000 hours of supervised experience before taking the licensing examinations. An intern can be supervised by either a licensed marriage and family therapist, a licensed clinical social worker, a licensed psychologist, or a board certified psychiatrist. The intern registration number issued by the Board of Behavioral Sciences will contain the letters IMF followed by five digits. Note: Formerly known as MFCC Intern.

Licensed Psychologist - has completed a four-year doctoral degree in psychology (Ph.D., Psy.D., or Ed.D), 3,000 hours of supervised experience, and passed written psychologist examinations (no oral examination as of January 2002). Psychologists may practice many different kinds of psychotherapy and are also trained to perform psychological testing. The license number issued by the California Board of Psychology will contain PSY followed by four to five digits.

Psychological Assistant - has completed a four-year doctoral degree in psychology (Ph.D., Psy.D., or Ed.D), and is in the process of obtaining the required 3,000 hours of supervised experience before taking the licensing examinations. A psychological assistant can be supervised by either a licensed psychologist or a board certified psychiatrist. The registration number issued by the California Board of Psychology will contain the letters PSB followed by five digits.

Psychiatrist - has completed a four-year medical or osteopathic degree (M.D. or D.O.), one year of medical internship, three years of psychiatric residency, and passed a medical or osteopathic examination. Psychiatrists are licensed physicians specially trained in the biomedical aspects of emotional problems and mental illness and are authorized to prescribe medication. They may also practice psychotherapy. Some have additional certification by the American Board of Psychiatry and Neurology. The license number will contain the letter A, C, or G followed by up to eight digits.