Quick answers
- Which hospitals does John S. Macgregor work at?
- Medicare's official clinician data lists John S. Macgregor at 2 hospitals: UCSF Medical Center and Zuckerberg San Francisco General Hosp & Trauma Ctr. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John S. Macgregor see patients?
- Medicare's clinician data lists 1 practice location in San Francisco, CA. Call before your visit to confirm the address.
- What is John S. Macgregor's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Internal Medicine.
- Does John S. Macgregor accept Medicare assignment?
- Yes. Medicare's clinician data says John S. Macgregor accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for John S. Macgregor?
- (628) 206-3503, as listed in official Medicare / NPI Registry data.
- What is John S. Macgregor's NPI number?
- 1831131846. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John S. Macgregor works
Medicare's Facility Affiliation Data lists John S. Macgregor at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · CCN 050454
- Zuckerberg San Francisco General Hosp & Trauma CtrSan Francisco, CA · Acute Care Hospital · CCN 050228
Practice locations
Addresses where John S. Macgregor is enrolled with Medicare (CMS data updated 2026-10-02).
- 1001 Potrero AveSan Francisco, CA 94110 (628) 206‑3503
Group practices
Medicare enrollment lists John S. Macgregor as a member of this group (CMS data updated 2026-10-02).
- University of California SFGH Medical Group587 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Js Weill Medical College, Cornell University |
| Graduation year | 1984 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831131846 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians