William Fan, FNP-C
NPI 1548833510 · Family Nurse Practitioner · Mountain View, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Fan, FNP-C is a Family Nurse Practitioner provider in Mountain View, CA (NPI 1548833510).
Provider details
- NPI number
- 1548833510
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-C
- Sex
- Male
- Sole proprietor
- No
- License
- 95016247 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Atorvastatin Calcium | 31 |
| Memantine Hcl | 27 |
| Gabapentin | 18 |
| Lisinopril | 17 |
| Losartan Potassium | 17 |
| Donepezil Hcl | 13 |
| Olanzapine | 13 |
| Famotidine | 12 |
| Mirtazapine | 12 |
| Metoprolol Succinate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-07-19
- Last updated
- 2023-09-29
- Certified
- 2023-09-29
Frequently asked questions
- What is William Fan's NPI number?
- William Fan's National Provider Identifier (NPI) is 1548833510, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Fan's specialty?
- William Fan is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Fan located?
- William Fan's practice location on file with NPPES is 701 E El Camino Real, Mountain View, CA 94040-2833.
- What is William Fan's phone number?
- The practice phone number listed in the NPPES registry for William Fan is (650) 734-7808.
- Does William Fan accept Medicare?
- William Fan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Fan's NPI active?
- Yes — William Fan's NPI (1548833510) is active in the NPPES registry as of the last update on 2023-09-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.