Physician Profile
John W. Duggan, M.D., M.S.
Unclaimed ProfileAbout Dr. Duggan
John W. Duggan, M.D., M.S. is a specialist based in San Jose, CA. John is a 1988 graduate of Tufts University School of Medicine. According to Medicare claims data, John cared for 122 Medicare patients across 130 services. The services billed most often include new patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more, established patient problem focused exam of visual system, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (408) 358-1600
- Email not available
Practice Locations
2516 SAMARITAN DR STE N
San Jose, CA 95124
Procedures Most Often Billed to Medicare
130 services · 122 patients · 5 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient problem focused exam of visual system | Treatment | 92012 |
35 | Less often than most peers in Specialist |
| Imaging of retina | Treatment | 92134 |
15 | Less often than most peers in Specialist |
| Photography of the retina | Treatment | 92250 |
11 | Less often than most peers in Specialist |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
45 | As often as other peers in Specialist |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
24 | Less often than most peers in Specialist |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other specialists in San Jose 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Tufts University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1988 at Tufts University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Established patient problem focused exam of visual system 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is John W. Duggan, M.D.?
John W. Duggan, M.D. is a specialist in San Jose, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
What is John W. Duggan, M.D.'s address?
John W. Duggan, M.D. is listed at 2516 Samaritan Dr Ste N, San Jose, CA 95124. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with John W. Duggan, M.D.?
The number on file is (408) 358-1600. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is John W. Duggan, M.D.'s NPI number?
John W. Duggan, M.D.'s National Provider Identifier is 1851313514. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did John W. Duggan, M.D. train?
John W. Duggan, M.D. attended Tufts University School of Medicine, graduating in 1988. This comes from the CMS National Downloadable File.
CMS public data
How long has John W. Duggan, M.D. been practicing?
John W. Duggan, M.D. has 38 years experience. Calculated from a graduation year of 1988, reported in the CMS National Downloadable File.
CMS public data
What procedures does John W. Duggan, M.D. perform?
According to Medicare billing data, John W. Duggan, M.D. provides treatments such as established patient problem focused exam of visual system and imaging of retina, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has John W. Duggan, M.D. confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by John W. Duggan, M.D.. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.