John Fullerton, M.D.
NPI 1588756266 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Fullerton, M.D. is a Internal Medicine Physician provider in San Francisco, CA (NPI 1588756266).
Provider details
- NPI number
- 1588756266
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G59000 (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
19 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 · 29 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Donepezil Hcl | 56 |
| Levothyroxine Sodium | 50 |
| Losartan Potassium | 37 |
| Mirtazapine | 35 |
| Memantine Hcl | 32 |
| Olanzapine | 27 |
| Atorvastatin Calcium | 24 |
| Lisinopril | 22 |
| Metformin Hcl | 21 |
| Omeprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-29
- Last updated
- 2015-09-23
Frequently asked questions
- What is John Fullerton's NPI number?
- John Fullerton's National Provider Identifier (NPI) is 1588756266, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Fullerton's specialty?
- John Fullerton is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Fullerton located?
- John Fullerton's practice location on file with NPPES is 1700 California St, San Francisco, CA 94109.
- What is John Fullerton's phone number?
- The practice phone number listed in the NPPES registry for John Fullerton is (415) 202-9990.
- Does John Fullerton accept Medicare?
- John Fullerton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Fullerton's NPI active?
- Yes — John Fullerton's NPI (1588756266) is active in the NPPES registry as of the last update on 2015-09-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.