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. Tim Grennan:
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- Currently 4 of 4 stars
The overall average patient rating of Dr. Tim Grennan is Excellent.
Specialties & Research
Dr. Tim Grennan, MD is board certified in Internal Medicine and Medical Oncology.
Education & Awards
Dr. Grennan graduated from University of Nebraska, Omaha.
Dr. Grennan has 4 hospital affiliations:
- Kaiser Foundation Hospital - Sacramento
- Kaiser Foundation Hospital - Roseville