Quick answers
- Which hospitals does Michael S. Greenfield work at?
- Medicare's official clinician data lists Michael S. Greenfield at 1 hospital: El Camino Health. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael S. Greenfield see patients?
- Medicare's clinician data lists 2 practice locations, including Mountain View, CA. Call before your visit to confirm the address.
- What is Michael S. Greenfield's specialty?
- Medicare lists Endocrinology as the primary specialty, and also Internal Medicine.
- Does Michael S. Greenfield accept Medicare assignment?
- Medicare's clinician data says Michael S. Greenfield may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Michael S. Greenfield offer telehealth?
- Medicare's clinician data says Michael S. Greenfield offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Michael S. Greenfield?
- (650) 965-7500, as listed in official Medicare / NPI Registry data.
- What is Michael S. Greenfield's NPI number?
- 1295873685. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Michael S. Greenfield works
Medicare's Facility Affiliation Data lists Michael S. Greenfield at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- El Camino HealthMountain View, CA · Acute Care Hospital · CCN 050308
Practice locations
Addresses where Michael S. Greenfield is enrolled with Medicare (CMS data updated 2026-10-02).
- 2500 Hospital Dr, Building 14Mountain View, CA 94040
- 2500 Hospital Dr, Suite 14Mountain View, CA 94040 (650) 965‑7500
Specialties
- Endocrinologyprimary
- Internal Medicinealso
Other endocrinologists in Mountain View
Clinicians with the same Medicare primary specialty in Mountain View, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvard Medical School |
| Graduation year | 1974 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1295873685 |
| 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