Mathias A. Masem, M.D.
Orthopaedic Hand Surgery Physician · Oakland, CA
Mathias A. Masem, M.D. is an orthopaedic hand surgery physician with a practice address in Oakland, California, and NPI 1508810938, issued on May 20, 2006. Check the license (California G34134, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mathias A. Masem
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Hand Surgery Physician 207XS0106X
- License number
- G34134 CA
Self-reported in NPPES; status is on the state search - Practice location
- 80 Grand Ave, Oakland, CA 94612
- Phone
- (510) 763-0884
- Enumerated
- May 20, 2006
- Record last updated
- Dec 18, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (510) 763-1574
- Medicaid ID
- 00G341340 CA
- Medicare enrollment
- Enrolled (PECOS I20050803000637); accepts Medicare assignment
- Medical or professional school
- University Of Minnesota Medical School, 1975
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest orthopaedic hand surgery physician records → All 288 in California → Look up another NPI →
Also registered at 80 Grand Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nancy Adams, M.D.Internal Medicine Physician1922543149
- William Billings, MDOrthopaedic Surgery Physician1710954649
- Mark Chan, MDSpecialist1871532945
- Xiang Fei, LACCase Manager/Care Coordinator1306968185
- Chang Kim, M.D.Orthopaedic Surgery Physician1720152507
- Sarah Langbein, PAPhysician Assistant1275747677
Verify Mathias A. Masem in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G34134Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average orthopaedic hand surgery physician in 2024
176 Medicare Part D claims for 72 beneficiaries, against an average of 186 among the 2,203 providers of this specialty who prescribed in Part D.
Most prescribed
- Meloxicam134 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 79.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $553.36
6 payments; by number, the most common kind was food and beverage; the largest payer was Axogen. The 1,819 providers of this specialty with any payment received $5,529.86 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 3 group practices
- Mathias Masem MDOakland, CA
- Ucsf Medical Group Business ServicesSan Francisco, CA
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mathias A. Masem among 288 orthopaedic hand surgery physician records in California
Mathias A. Masem, M.D. is one of 288 orthopaedic hand surgery physician records with a practice address in California. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 52% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1975 · median 2004 among the 214 with a school on file
- Record last updated2014 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207XS0106X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Hand Surgery Physician providers in California
There are 288 orthopaedic hand surgery physician records in California.
All 288 in California → Every provider in Oakland → Orthopaedic Hand Surgery Physician nationwide →
The 8 orthopaedic hand surgery physician records with the nearest ZIP codes
- Christopher Cox, M.D.Oakland, CA 946121013104215
- Kendrick Lee, MDOakland, CA 946111508833377
- Austin Pitcher, MD, PHDOakland, CA 946111023428901
- Eric Stuffmann, M.D.Oakland, CA 946111922294719
- Suresh Nayar, MDOakland, CA 946091760805055
- Wayne Pan, MD, PHD, MBAOakland, CA 946081114265949
- Divya Singh, M.D.Oakland, CA 946021235264540
- Tyler Clark, MDWalnut Creek, CA 945981831453778
Common questions
What is Mathias A. Masem, M.D.'s NPI number?
Mathias A. Masem, M.D.'s National Provider Identifier (NPI) is 1508810938, issued on May 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mathias A. Masem, M.D. located?
The NPPES record lists a practice address at 80 Grand Ave, Oakland, CA, 94612. Phone: (510) 763-0884. Providers update this record themselves, so call before visiting.
How can I verify Mathias A. Masem, M.D.'s license?
NPPES lists California license number G34134, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mathias A. Masem, M.D. prescribe under Medicare Part D?
In 2024, Mathias A. Masem, M.D. had 176 Medicare Part D claims for 72 beneficiaries; the average among orthopaedic hand surgery physician prescribers was 186. Part D covers Medicare prescriptions only.
What is Mathias A. Masem, M.D.'s MIPS final score?
The 2023 MIPS final score is 79.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.