Quick answers
- Which hospitals does Ronald S. Greenwald work at?
- Medicare's official clinician data lists Ronald S. Greenwald at 1 hospital: San Mateo Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ronald S. Greenwald see patients?
- Medicare's clinician data lists 4 practice locations, including San Mateo, CA and Mountain View, CA. Call before your visit to confirm the address.
- What is Ronald S. Greenwald's specialty?
- Medicare lists Neurosurgery as the primary specialty.
- Does Ronald S. Greenwald accept Medicare assignment?
- Yes. Medicare's clinician data says Ronald S. Greenwald 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 Ronald S. Greenwald?
- (650) 968-4747, as listed in official Medicare / NPI Registry data.
- What is Ronald S. Greenwald's NPI number?
- 1316954191. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ronald S. Greenwald works
Medicare's Facility Affiliation Data lists Ronald S. Greenwald at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- San Mateo Medical CenterSan Mateo, CA · Acute Care Hospital · CCN 050113
Practice locations
Addresses where Ronald S. Greenwald is enrolled with Medicare (CMS data updated 2026-10-02).
- 22 W 39th Ave, Hos316msSan Mateo, CA 94403
- 222 W 39th AveSan Mateo, CA 94403
- 2660 Solace PlMountain View, CA 94040 (650) 968‑4747
- 2660 Solace Pl CMountain View, CA 94040
Group practices
Medicare enrollment lists Ronald S. Greenwald as a member of this group (CMS data updated 2026-10-02).
- County of San Mateo310 clinicians in the group
Specialties
- Neurosurgeryprimary
Other neurosurgeons in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Chicago College Of Medicine And Surgery |
| Graduation year | 1979 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1316954191 |
| 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