Mathias MasemM.D.
Orthopedic Surgery·Oakland, CA
Mathias Masem, M.D. is an Orthopedic Surgery provider in Oakland, CA affiliated with 1 ambulatory surgery center in CA, as of July 2026.
- NPI1508810938
- Registered2006
- Centers1
- StateCA
- Class of1975
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Ambulatory surgery centers
Centers whose service lines match this provider’s. Affiliations change; verify independently.
Education
Education on record as of August 2026.
Mathias Masem at a glance
- Provider
- Mathias Masem
- Credential
- M.D.
- Specialty
- Orthopedic Surgery
- Procedures
- Orthopedic Surgery CPT codes
- Location
- Oakland, CA
- Medical school
- University of Minnesota Medical School
- Graduated
- 1975
- NPI registered
- 2006
- NPI
- 1508810938
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Mathias Masem practice?
Mathias Masem, M.D. is based in Oakland, CA and is affiliated with 1 ambulatory surgery center: The Surgery Center Of Alta Bates Summit Medical Center LLC in Oakland, CA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Mathias Masem's NPI number?
Mathias Masem's National Provider Identifier (NPI) is 1508810938, registered in 2006. Specialty on record: Orthopedic Surgery; credential M.D.
Where did Mathias Masem go to medical school?
Mathias Masem, M.D. attended University of Minnesota Medical School, graduating in 1975.
How many Orthopedic Surgery providers in California work at ambulatory surgery centers?
538 Orthopedic Surgery surgeons and proceduralists in California are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Mathias Masem among them. The California Orthopedic Surgery directory lists each one by city with credential, NPI, and center affiliations.
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