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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).

Learn more about Dr. Marc Greenstadt:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. Marc Greenstadt is Good. Dr. Greenstadt has been reviewed by 15 patients who have provided 3 comments. The rating is 4 out of 5 stars.

Patient Ratings
Ease of Appointment 4.1
Promptness 4.5
Courteous Staff 3.8
Accurate Diagnosis 4.5
Bedside Manner 4.5
Spends Time with Me 4.4
Follows Up After Visit 3.8

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 3 awards.

Castle Connolly's Top Doctors™ (2012 - 2013)
Compassionate Doctor Recognition (2013, 2015)
On-Time Doctor Award (2015)


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 36 years of experience and practices in Internal Medicine.
Where does Dr. Marc Greenstadt practice?
Dr. Marc Greenstadt has 1 office location.
Dr. Marc Greenstadt practices Internal Medicine near Northridge, CA.
See Northridge Internists.