Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Mathias A. Masem, MD

Individual provider Orthopaedic Surgery Physician · NPI 1508810938

Dr. Mathias A. Masem, MD is an Orthopedic Surgery in Oakland, California. Graduated from University of Minnesota Medical School in 1975, 51 years ago. Practices with UCSF Medical Group Business Services, a 1,531-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
51
Trained at
University of Minnesota Medical School
Licensed in
CA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

80 Grand Ave Ste 600
Oakland, CA 94612-3744
Phone: (510) 763-0884
Fax: (510) 763-1574
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Orthopaedic Hand Surgery Physician (primary) Taxonomy 207XS0106X · Licence G34134 (CA)
Orthopaedic Surgery Physician Taxonomy 207X00000X · Licence G34134 (CA)

Record details

NPI number1508810938
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 20, 2006
Last updated in NPPESDecember 18, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolUNIVERSITY OF MINNESOTA MEDICAL SCHOOL
Graduated 1975 (51 years in practice)
Group practice Ucsf Medical Group Business Services — 1531 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations4 on file with Medicare

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