Gillian Foley, MD
NPI 1164002333 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gillian Foley, MD is a Internal Medicine Physician provider in San Francisco, CA (NPI 1164002333).
Provider details
- NPI number
- 1164002333
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 328422 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
5 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
73 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 53 | $129 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 20 | $72 |
Typical Medicare-allowed amounts for these services range $72–$129 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 61 | 27 |
| Amlodipine Besylate | 45 | 19 |
| Fluticasone Propionate | 29 | — |
| Metformin Hcl | 25 | — |
| Semaglutidebrand: Ozempic | 20 | — |
| Carvedilol | 19 | — |
| Empagliflozinbrand: Jardiance |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-04-12
- Last updated
- 2025-08-01
- Certified
- 2025-08-01
Frequently asked questions
- What is Gillian Foley's NPI number?
- Gillian Foley's National Provider Identifier (NPI) is 1164002333, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gillian Foley's specialty?
- Gillian Foley is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gillian Foley located?
- Gillian Foley's practice location on file with NPPES is 521 Parnassus Ave, San Francisco, CA 94143-2206.
- What is Gillian Foley's phone number?
- The practice phone number listed in the NPPES registry for Gillian Foley is (415) 514-1378.
- Does Gillian Foley accept Medicare?
- Gillian Foley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gillian Foley's NPI active?
- Yes — Gillian Foley's NPI (1164002333) is active in the NPPES registry as of the last update on 2025-08-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.