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).
Learn more about Dr. Patrick O'Callahan:
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Specialties & Research
Dr. Patrick O'Callahan, MD is board certified in Family Medicine.
Education & Awards
Dr. O'Callahan graduated from Columbia University, New York.
Dr. O'Callahan has 3 hospital affiliations:
- Stanford Hospital and Clinics
- Stanford Medical Center
- Lawrence And Memorial Hospital, New London CT
Accepted Insurance Plans
Dr. O'Callahan accepts these health insurances in at least one office:
- United Healthcare - 5 plans
- Great-West Healthcare - 1 plan
- Cigna - 2 plans
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- Additional Information
- Where does Dr. Patrick D. O'Callahan practice?
Dr. Patrick O'Callahan practices Family Medicine near Cambridge, MA.
Additional practice locations include: Stanford, CA.
See Cambridge Family Physicians.