John Fahy, MD
NPI 1295789550 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Fahy, MD is a Internal Medicine Physician provider in San Francisco, CA (NPI 1295789550).
Provider details
- NPI number
- 1295789550
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- A53767 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 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
63 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 41 | $159 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 22 | $109 |
Typical Medicare-allowed amounts for these services range $109–$159 (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 · 12 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Dupilumabbrand: Dupixent Pen | 34 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 31 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 27 |
| Mepolizumabbrand: Nucala | 27 |
| Dupilumabbrand: Dupixent Syringe | 21 |
| Tiotropium Bromidebrand: Spiriva Respimat | 21 |
| Benralizumabbrand: Fasenra Pen | 20 |
| Mometasone/Formoterolbrand: Dulera |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-20
- Last updated
- 2007-07-09
Frequently asked questions
- What is John Fahy's NPI number?
- John Fahy's National Provider Identifier (NPI) is 1295789550, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Fahy's specialty?
- John Fahy is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Fahy located?
- John Fahy's practice location on file with NPPES is 400 Parnassus Ave, San Francisco, CA 94143-2202.
- What is John Fahy's phone number?
- The practice phone number listed in the NPPES registry for John Fahy is (415) 353-2961.
- Does John Fahy accept Medicare?
- John Fahy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Fahy's NPI active?
- Yes — John Fahy's NPI (1295789550) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.