Ronald S. Greenwald, M.D.
Neurological Surgery Physician · Mountain View, CA
Ronald S. Greenwald, M.D. is a neurological surgery physician with a practice address in Mountain View, California, and NPI 1316954191, issued on Aug 2, 2006. Check the license (California G56400, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ronald S. Greenwald
- Credential
- M.D.
- Primary taxonomy
- Neurological Surgery Physician 207T00000X
- License number
- G56400 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Hospital Dr Bldg 15, Mountain View, CA 94040
- Phone
- (650) 968-4747
- Enumerated
- Aug 2, 2006
- Record last updated
- Oct 16, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (650) 968-8086
- Medicare enrollment
- Enrolled (PECOS I20081013000108); accepts Medicare assignment
- Medical or professional school
- Chicago College Of Medicine And Surgery, 1979
- Entity
- Type 1 · individual
8 nearest neurological surgery physician records → All 929 in California → Look up another NPI →
Verify Ronald S. Greenwald in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G56400Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% more Medicare Part D claims than the average neurological surgery physician in 2024
181 Medicare Part D claims for 47 beneficiaries, against an average of 172 among the 4,378 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Methylprednisolone24 claims
- Prednisone22 claims
- Diclofenac Sodium20 claims
- Naproxen19 claims
- Celecoxib18 claims
- Gabapentin18 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- County OF San MateoSan Mateo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald S. Greenwald among 929 neurological surgery physician records in California
Ronald S. Greenwald, M.D. is one of 929 neurological surgery physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 62% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1979 · median 2005 among the 612 with a school on file
- Record last updated2014 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207T00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurological Surgery Physician providers in California
There are 929 neurological surgery physician records in California.
All 929 in California → Every provider in Mountain View → Neurological Surgery Physician nationwide →
The 8 neurological surgery physician records with the nearest ZIP codes
- Jay Hess, MDMountain View, CA 940401831205541
- Scott Wachhorst, M.D.Mountain View, CA 940401619926581
- Albert Wong, MDMenlo Park, CA 940251720809858
- Marshal Rosario, M.D.Los Altos, CA 940241770655821
- Allen Efron, MDRedwood City, CA 940631831277482
- Cecil Jun, MDRedwood City, CA 940631790863389
- Alexander Kleider, MDRedwood City, CA 940631659459204
- Tina Nguyen, M.D.Redwood City, CA 940631033381553
Common questions
What is Ronald S. Greenwald, M.D.'s NPI number?
Ronald S. Greenwald, M.D.'s National Provider Identifier (NPI) is 1316954191, issued on Aug 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald S. Greenwald, M.D. located?
The NPPES record lists a practice address at 2500 Hospital Dr Bldg 15, Mountain View, CA, 94040. Phone: (650) 968-4747. Providers update this record themselves, so call before visiting.
How can I verify Ronald S. Greenwald, M.D.'s license?
NPPES lists California license number G56400, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ronald S. Greenwald, M.D. prescribe under Medicare Part D?
In 2024, Ronald S. Greenwald, M.D. had 181 Medicare Part D claims for 47 beneficiaries; the average among neurological surgery physician prescribers was 172. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.