John Winston Duggan, M.D., M.S.
Specialist · San Jose, CA
John Winston Duggan, M.D., M.S. is a specialist with a practice address in San Jose, California, and NPI 1851313514, issued on Jul 24, 2006. Check the license (California G683170, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John Winston Duggan
- Credential
- M.D., M.S.
- Primary taxonomy
- Specialist 174400000X
- License number
- G683170 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2516 Samaritan Dr Ste N, San Jose, CA 95124
- Phone
- (408) 358-1600
- Enumerated
- Jul 24, 2006
- Record last updated
- Apr 9, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (408) 358-1610
- Medicare enrollment
- Enrolled (PECOS I20120203000073); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1988
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Verify John Winston Duggan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G683170Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through 2 group practices
- Desert Elite Eye Group IncPalm Desert, CA
- Desert Ophthalmology Medical CorporationPalm Springs, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Winston Duggan among 5,749 specialist records in California
John Winston Duggan, M.D., M.S. is one of 5,749 specialist records with a practice address in California. 30% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1988 · median 1989 among the 1,075 with a school on file
- Record last updated2019 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in San Jose → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Kenneth Blumenfeld, M.D.San Jose, CA 951241235158254
- Dorothy Buckner, M.D.San Jose, CA 951241275681355
- Mark Eastham, M.D.San Jose, CA 951241881610376
- Jacklyn Egnor, CMT, NCMMTSan Jose, CA 951241831386242
- Mitra Emami, M.D.San Jose, CA 951241720145147
- Michael Gold, M.D.San Jose, CA 951241760414130
- David Hirschfeld, M.D.San Jose, CA 951241730111907
- Jeffrey Holmes, MD., JD., MBASan Jose, CA 951241376648030
Common questions
What is John Winston Duggan, M.D., M.S.'s NPI number?
John Winston Duggan, M.D., M.S.'s National Provider Identifier (NPI) is 1851313514, issued on Jul 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Winston Duggan, M.D., M.S. located?
The NPPES record lists a practice address at 2516 Samaritan Dr Ste N, San Jose, CA, 95124. Phone: (408) 358-1600. Providers update this record themselves, so call before visiting.
How can I verify John Winston Duggan, M.D., M.S.'s license?
NPPES lists California license number G683170, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
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.