Stephen James Matzat, MD
Family Medicine Physician · San Francisco, CA
Stephen James Matzat, MD is a family medicine physician with a practice address in San Francisco, California, and NPI 1841855764, issued on May 6, 2019. Check the license (California A179041, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen James Matzat
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A179041 CA
Self-reported in NPPES; status is on the state search - Practice location
- 995 Potrero Ave Bldg 80, San Francisco, CA 94110
- Phone
- (831) 755-4123
- Enumerated
- May 6, 2019
- Record last updated
- Aug 11, 2022
- Medicare enrollment
- Enrolled (PECOS I20231018000018); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 2019
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 995 Potrero Ave Bldg 80
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Emma Bainbridge, MD, MPHInfectious Disease Physician1427443811
- Gioia Berlin, LCSWClinical Social Worker1801504774
- Annette Burns, NPPrimary Care Nurse Practitioner1700913795
- Samira CausevicCase Manager/Care Coordinator1518388578
- Floria Chi, M.D., M.P.H.Student in an Organized Health Care Education/Training Program1922445923
- Magdalen Edmunds, M.D.Family Medicine Physician1619203668
Verify Stephen James Matzat in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A179041Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average family medicine physician in 2024
438 Medicare Part D claims for 55 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Albuterol Sulfate Hfa26 claims
- Atorvastatin Calcium24 claims
- Gabapentin22 claims
- Tamsulosin Hcl20 claims
- Fluticasone Propionate18 claims
- Pantoprazole Sodium16 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): 90.3 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).
Bills Medicare through one group practice
- City And County OF San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen James Matzat among 17,133 family medicine physician records in California
Stephen James Matzat, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 85% of them.
- NPI issued2019 · 85% of these records are older, 12% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2019 · median 2005 among the 10,652 with a school on file
- Record last updated2022 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Francisco → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Joaquin Barahona, M. D.San Francisco, CA 941101205895133
- Luis Bonilla, MDSan Francisco, CA 941101629019708
- Christopher Bositis, MDSan Francisco, CA 941101427054493
- Romilda Foresti-Lorente, MDSan Francisco, CA 941101164455374
- Steven Lawton, MDSan Francisco, CA 941101366486748
- Todd May, MDSan Francisco, CA 941101679528335
- Pooja Mittal, DOSan Francisco, CA 941101215916200
- David Nidorf, MDSan Francisco, CA 941101336186121
Common questions
What is Stephen James Matzat, MD's NPI number?
Stephen James Matzat, MD's National Provider Identifier (NPI) is 1841855764, issued on May 6, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Stephen James Matzat, MD located?
The NPPES record lists a practice address at 995 Potrero Ave Bldg 80, San Francisco, CA, 94110. Phone: (831) 755-4123. Providers update this record themselves, so call before visiting.
How can I verify Stephen James Matzat, MD's license?
NPPES lists California license number A179041, 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 Stephen James Matzat, MD prescribe under Medicare Part D?
In 2024, Stephen James Matzat, MD had 438 Medicare Part D claims for 55 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Stephen James Matzat, MD's MIPS final score?
The 2023 MIPS final score is 90.3 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.