The American Board of Medical Specialties.
Physicians certified by an ABMS Member Board have successfully completed an approved training program and an evaluation process assessing their ability to provide quality patient care in the specialty. Search by physician name or specialty.
Note: you need to register with the service before searching. Registration is free and your search is limited to five doctors a day.
http://www.abms.org/login.asp

American Medical Association- Physician Select
provides information on virtually every licensed physician in the United States and its possessions. All physician credential data have been verified for accuracy and authenticated by accrediting agencies, medical schools, residency training programs, licensing boards, and other data sources.
http://www.ama-assn.org/aps/amahg.htm
Click on “Search for a Physician” to begin the process.

New York State Department of Health Office of Professional Misconduct
Physician Discipline actions taken against doctors registered with New York State.
Note: The database contains actions taken for 1990 and later.
http://w3.health.state.ny.us/opmc/factions.nsf

New York State Education Department-License Verification
Verifies if the doctor is licensed to practice medicine in New York State. Can search by license number or doctor’s name.
http://www.op.nysed.gov/opsearches.htm

New York State Physician Profile
Profiles of all licensed doctors of medicine and doctors of osteopathy who are registered to practice in New York State.
http://www.nydoctorprofile.com/welcome.jsp

If you would like to register a complaint against a physician in New York State:
http://www.health.state.ny.us/nysdoh/opmc/howto2.htm