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Surgical Specialist, Orthopaedic Surgeon, Sports Medicine Specialist
29 years of experience
Accepting new patients
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. Dirk Diefendorf:

View the full profile to get information on:

  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (5)

The overall average patient rating of Dr. Dirk Diefendorf is Good. Dr. Diefendorf has been reviewed by 13 patients who have provided 5 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.3
Promptness 3.0
Courteous Staff 3.3
Accurate Diagnosis 3.7
Bedside Manner 3.5
Spends Time with Me 3.5
Follows Up After Visit 4.1

Specialties & Research

Dr. Dirk Diefendorf, MD is board certified in Orthopaedic Surgery and Orthopaedic Surgery - Sports Medicine.

  • He has special expertise in 3 areas:
  • Hip Osteoarthritis
  • Knee Osteoarthritis
  • Osteoarthritis (Hand and Wrist)

Education & Awards

Dr. Diefendorf graduated from Northwestern University, Chicago.


Dr. Diefendorf has 5 hospital affiliations:

  • Mills-Peninsula Health Services 
  • Sequoia Hospital 


  • English
  • Spanish

> > > > Dr. Dirk Diefendorf, MD

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Additional Information
Dr. Dirk Ross Diefendorf MD is a male Orthopaedic Surgeon, has 29 years of experience and practices in Orthopaedic Surgery and Sports Medicine.
Where does Dr. Dirk R. Diefendorf practice?
Dr. Dirk Diefendorf has 1 office location.
Dr. Dirk Diefendorf practices Orthopaedic Surgery and Sports Medicine near San Mateo, CA.
See San Mateo Surgeons and San Mateo Sports Medicine Doctors.