Skip to Main Content

Mathias A. Masem


Orthopedic surgeon

Dr. Mathias Masem is an orthopedic surgeon with more than 20 years of experience in surgeries of the hand and upper extremities.

Masem earned his medical degree at the University of Minnesota. He completed general surgery training and a residency in orthopedic surgery at UCSF, then completed a hand surgery fellowship under esteemed hand surgeon Dr. Jack Tupper in Oakland. He spent the following two years as an orthopedic research physician in Switzerland at the University of Bern and the Laboratory for Experimental Surgery. He furthered his training in hand and upper extremity surgery and microsurgery as a clinical and research fellow at Massachusetts General Hospital and Harvard Medical School.

In addition to his work at UCSF, Masem has a private practice in Oakland and is chief of hand surgery at Alta Bates Summit Medical Center. He also is a consultant on hand and upper extremity injuries for the University of California, Berkeley athletic teams.

Masem has authored numerous articles and given many lectures on upper extremity orthopedic surgery.

  • Education

    University of Minnesota, 1975

  • Residencies

    UCSF Medical Center, Surgery, 1976

  • Fellowships

    UCSF Medical Center, Hand Surgery, 1984

    UCSF Medical Center, Orthopaedic Surgery, 1984

  • Board Certifications

    Surgery of the Hand, American Board of Orthopaedic Surgery.

    Orthopaedic Surgery, American Board of Orthopaedic Surgery.

Where I see patients (1)

    My reviews


    Overall Experience
    100 Ratings
    About our process
    Feb 20, 2023
    Jan 25, 2023
    Dr. Masem is the reason I came to UCSF.
    Jan 14, 2023
    Dr Masem is very thorough to obtain the relevant information with regard to my ailments and symptoms.He has provided me with two referral physicians and will follow up with their examination results.Thank Dr Masem for the excellent care given to me.
    Jan 09, 2023
    Nov 07, 2022
    The doctor is excellent. My problem is with how dysfunctional the health care system is
    Oct 10, 2022
    The injection didn't help at all. I'm in excruciating pain still. It is very very hard to get a hold of the doctor to ask a simple question of why the suggested treatment didn't work. We are charged again for a visit. But dr. Masem was confident he knew what to do and that it would work. I had the same condition a year ago and got an injection for decravein and the pain went away immediately. This time it has worsened but I left the area to teach overseas as I told dr. Masem. So I am in a very bad position having trusted him.
    Sep 03, 2022
    Apr 16, 2022
    Disappointed in care Dr seemed rushed. Did not give me understanding of surgery being recommended
    Mar 06, 2022
    Doctor did not introduce himself or greet me by name. Doctor had not reviewed my medical file in advance as he began explaining a procedure that was not applicable to my medical issue
    Feb 19, 2022
    Dr. Masem was excellent in the care and attention he gave to my situation and in providing me with information.
    Dec 20, 2021
    Nov 11, 2021
    Unfortunately the provider did not practice hand hygiene.
    Jul 03, 2021
    Recommended surgery without explaining with x-ray what will be done
    Jun 08, 2021
    They just didn't share a lot about what was actually going on and I wanted to understand it more and asked a lot of questions
    Jun 05, 2021
    very good
    Jun 05, 2021
    Oh my gosh ... I can't describe the relief I felt during my visit with Dr. Masem - he was so knowledgeable and caring. He prescribed something that will not only help my hands it will help my arthritis overall including my knees I'm so grateful that he's addressing the source issue along with the PT referral for the symptoms. I had to answer your survey to rave about Dr. Masem and the consideration your waiting room receptionist showed me and others - thank you for
    May 08, 2021
    I feel so lucky to have been scheduled with this doctor and his student.