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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

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Additional Information
Dr. Arthur Clarence O'Brien MD is a male Family Practitioner and practices in Family Medicine.
Where does Dr. Arthur C. O'Brien practice?
Dr. Arthur O'Brien has 1 office location.
Dr. Arthur O'Brien practices Family Medicine near Castro Valley, CA.
See Castro Valley Family Physicians.