Stephen Vaughan, MD
Internal Medicine Physician · Redwood City, CA
Stephen Vaughan, MD is an internal medicine physician with a practice address in Redwood City, California, and NPI 1417010869, issued on Dec 18, 2006. Check the license (California C53520, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen Vaughan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- C53520 CA
224878 NY
Self-reported in NPPES; status is on the state search - Practice location
- 170 Alameda DE Las Pulgas, Redwood City, CA 94062
- Phone
- (650) 369-5811
- Enumerated
- Dec 18, 2006
- Record last updated
- Jul 29, 2026
- Medicare enrollment
- Enrolled (PECOS I20090130000612); accepts Medicare assignment
- Medical or professional school
- Js Weill Medical College, Cornell University, 1998
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 170 Alameda DE Las Pulgas
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- David Adams, M.DEmergency Medicine Physician1891735643
- Michele AdkissonPerfusionist1831321447
- Jyothi Adsumilli, M.D.,Hospitalist Physician1245508159
- Ari AuwinitzkyPerfusionist1629585583
- Marjorie Berry Simon, LCSWClinical Social Worker1639477532
Verify Stephen Vaughan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C53520Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
100 Medicare Part D claims for 53 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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): 72 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
- Vituity Hospitalists PCRedwood City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Vaughan among 17,696 internal medicine physician records in California
Stephen Vaughan, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1998 · median 2004 among the 11,065 with a school on file
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
85 internal medicine physician records list a practice address in Redwood City
They are 85 of the 2,795 NPPES records with a practice address in Redwood City, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Redwood City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Gary Aron, M.D.Redwood City, CA 940621619984911
- Denise Brown, M.D.Redwood City, CA 940621518979442
- Barrett Bryan, MDRedwood City, CA 940621033133954
- David Dorrance, M.D.Redwood City, CA 940621871657601
- Christopher Dunn, M.D.Redwood City, CA 940621386724276
- Hailing Fei, MDRedwood City, CA 940621861400350
- Sabitha Krishnamoorthy, MDRedwood City, CA 940621245408731
- Priyasheelta Nand, M.D.Redwood City, CA 940621174843916
Common questions
What is Stephen Vaughan, MD's NPI number?
Stephen Vaughan, MD's National Provider Identifier (NPI) is 1417010869, issued on Dec 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Vaughan, MD located?
The NPPES record lists a practice address at 170 Alameda DE Las Pulgas, Redwood City, CA, 94062. Phone: (650) 369-5811. Providers update this record themselves, so call before visiting.
How can I verify Stephen Vaughan, MD's license?
NPPES lists California license number C53520, 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 Vaughan, MD prescribe under Medicare Part D?
In 2024, Stephen Vaughan, MD had 100 Medicare Part D claims for 53 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Stephen Vaughan, MD's MIPS final score?
The 2023 MIPS final score is 72 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.