In order to be a member of NPA you must join The American Psychiatric Association (APA).
To join APA please go to their web site: http://www.psychiatry.org/join-participate/become-a-member
APA Membership Categories:
Medical Student Member (MS) - Individuals who are enrolled in a U.S. or Canadian school of medicine, including osteopathic medicine, and remain enrolled therein. Medical Student Members are dues exempt and are required to belong at the national level only (exempt from dual membership requirement).
Members-in-Training (MT) - Physicians who have been accepted into a psychiatric residency training program that is approved by the ACGME, RCPS(C), or AOA and remain enrolled therein. Residents enrolled in a one- year primary care training program to be followed by an approved psychiatric residency are eligible for Member-in-Training status. Your First Year of APA Dues as a Member-in-Training is waived! After that, your annual national dues are only $80/U.S. and $50/Canada.
General Members (GM) - Physicians who have completed an acceptable program of training in psychiatry, and hold either a valid license to practice medicine or hold an academic, research, or governmental position that does not require licensure. General Members may apply for Fellowship or be nominated for Distinguished Fellowship provided they meet the eligibility requirements.
International Member (IM) - Physicians who live outside the United States and Canada and who meet the criteria established for General Members. Applicants for this category must be licensed physicians who have completed an acceptable program of training in psychiatry; they must also have the support of one APA member (not including Medical Students and Members-in-Training.
International Fellow (IF) - Physicians who live outside the United States and Canada and who meet the criteria for Fellowship (i.e., having made significant and continued contributions to the field of psychiatry) and who have the support of one Fellow and/or International Fellow of APA.