Browse Health
Family Practitioner, Primary Care Doctor
16 years of experience
Accepting new patients
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).

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 

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Additional Information
Dr. Patrick Damien O'Callahan MD is a male Family Practitioner, has 16 years of experience and practices in Family Medicine.
Where does Dr. Patrick D. O'Callahan practice?
Dr. Patrick O'Callahan has 2 office locations.
Dr. Patrick O'Callahan practices Family Medicine near Cambridge, MA.
Additional practice locations include: Stanford, CA.
See Cambridge Family Physicians.