Psychotherapists are licensed professional counselors, social workers or psychologists who provide counseling/talk therapy but do not prescribe medications.
Psychiatrists are medical doctors specializing in the treatment of mental health and behavioral issues and can prescribe medications. They sometimes also offer counseling.
Physicians in other Specialties are medical doctors with specialties other than psychiatry.
Other Disciplines are individuals, clinics or programs offering support, education or wellness services in a wide variety of disciplines outside of traditional talk therapy or medicine.