John Duggan, M.D., M.S.
NPI 1851313514 · Specialist · San Jose, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Duggan, M.D., M.S. is a Specialist provider in San Jose, CA (NPI 1851313514).
Provider details
- NPI number
- 1851313514
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D., M.S.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G683170 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
130 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 45 | $172 |
| Established Patient Problem Focused Exam of Visual System92012 | 35 | $93 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 24 | $132 |
| Imaging of Retina92134 | 15 | $42 |
| Photography of the Retina92250 | 11 | $39 |
Typical Medicare-allowed amounts for these services range $39–$172 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-24
- Last updated
- 2019-04-09
Frequently asked questions
- What is John Duggan's NPI number?
- John Duggan's National Provider Identifier (NPI) is 1851313514, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Duggan's specialty?
- John Duggan is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is John Duggan located?
- John Duggan's practice location on file with NPPES is 2516 Samaritan Dr Ste N, San Jose, CA 95124-4108.
- What is John Duggan's phone number?
- The practice phone number listed in the NPPES registry for John Duggan is (408) 358-1600.
- Does John Duggan accept Medicare?
- John Duggan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Duggan's NPI active?
- Yes — John Duggan's NPI (1851313514) is active in the NPPES registry as of the last update on 2019-04-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.