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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).


Our records indicate this doctor is a student.

Learn more about Dr. Mary O:

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Dr. O has 1 hospital affiliations:

  • Yale-New Haven Hospital 

> Dr. Mary O, MD

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Additional Information
Dr. Mary Jean O MD is a female doctor and practices in .
Where does Dr. Mary J. O practice?
Dr. Mary O has 1 office location.
Dr. Mary O practices near New Haven, CT.