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Internist, Oncology Specialist (cancer)
34 years of experience
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. Tim Grennan:

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  1. Qualifications
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Patient Reviews

  • Currently 4 of 4 stars
Patient comments (0)

The overall average patient rating of Dr. Tim Grennan is Excellent. Dr. Grennan has been reviewed by 1 patients who have provided 0 comments. The rating is 4 out of 4 stars.

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 

> > > > Dr. Tim Grennan, MD

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Additional Information
Dr. Tim William Grennan MD is a male Internist, has 34 years of experience and practices in Internal Medicine and Medical Oncology.
Where does Dr. Tim W. Grennan practice?
Dr. Tim Grennan has 1 office location.
Dr. Tim Grennan practices Internal Medicine and Medical Oncology near Sacramento, CA.
See Sacramento Internists and Sacramento Oncologists.