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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).

Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. Marc Greenstadt is Excellent. Dr. Greenstadt has been reviewed by 11 patients who have provided 3 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.3
Promptness 4.6
Courteous Staff 3.9
Accurate Diagnosis 4.8
Bedside Manner 4.8
Spends Time with Me 4.6
Follows Up After Visit 3.9

Specialties & Research

Dr. Marc Greenstadt, MD is board certified in Internal Medicine.

Education & Awards

Dr. Greenstadt graduated from University of California at Los Angeles. He has 2 awards.

Castle Connolly's Top Doctors™ (2012 - 2013)
Compassionate Doctor Recognition (2013)


Dr. Greenstadt has 3 hospital affiliations:

  • Valley Presbyterian Hospital 
  • Northridge Hospital Medical Center, Roscoe Boulevard Campus 
  • Northridge Hospital Med Ctr Rosco 


  • English

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Additional Information
Dr. Marc Greenstadt MD is a male Internist, has 35 years of experience and practices in Internal Medicine.
Where does Dr. Marc Greenstadt practice?
Dr. Marc Greenstadt has 2 office locations.
Dr. Marc Greenstadt practices Internal Medicine near Northridge, CA.
Additional practice locations include: Van Nuys, CA.
See Northridge Internists.