Yi-Jen Fong, MD
NPI 1841558103 · Internal Medicine Physician · Campbell, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Yi-Jen Fong, MD is a Internal Medicine Physician provider in Campbell, CA (NPI 1841558103).
Provider details
- NPI number
- 1841558103
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A124113 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
14 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 18 | 18 |
| Amlodipine Besylate | 16 | 12 |
| Amlodipine Bes/Olmesartan Medbrand: Amlodipine-Olmesartan | 12 | — |
| Nebivolol Hcl | 12 | — |
| Sertraline Hcl | 12 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-04-24
- Last updated
- 2024-08-05
- Certified
- 2024-08-04
Frequently asked questions
- What is Yi-Jen Fong's NPI number?
- Yi-Jen Fong's National Provider Identifier (NPI) is 1841558103, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Yi-Jen Fong's specialty?
- Yi-Jen Fong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Yi-Jen Fong located?
- Yi-Jen Fong's practice location on file with NPPES is 220 E Hacienda Ave, Campbell, CA 95008-6617.
- What is Yi-Jen Fong's phone number?
- The practice phone number listed in the NPPES registry for Yi-Jen Fong is (408) 871-6500.
- Does Yi-Jen Fong accept Medicare?
- Yi-Jen Fong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Yi-Jen Fong's NPI active?
- Yes — Yi-Jen Fong's NPI (1841558103) is active in the NPPES registry as of the last update on 2024-08-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.