William S. Warshal, MD
Family Medicine Physician · Los Gatos, CA
William S. Warshal, MD is a family medicine physician with a practice address in Los Gatos, California, and NPI 1285620666, issued on Sep 21, 2005. Check the license (California G41468, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William S. Warshal
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G41468 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15251 National Ave Ste 104, Los Gatos, CA 95032
- Phone
- (408) 605-8612
- Enumerated
- Sep 21, 2005
- Record last updated
- May 1, 2024
- Fax
- (650) 631-2448
- Medicaid ID
- 00G414681 CA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 15251 National Ave Ste 104
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brianne Ross, FNPFamily Nurse Practitioner1285392381
Verify William S. Warshal in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G41468Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
61% fewer Medicare Part D claims than the average family medicine physician in 2024
1,399 Medicare Part D claims for 51 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Amlodipine Besylate161 claims
- Metoprolol Tartrate108 claims
- Atorvastatin Calcium92 claims
- Losartan Potassium86 claims
- Levothyroxine Sodium77 claims
- Gabapentin70 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.
William S. Warshal among 17,133 family medicine physician records in California
William S. Warshal, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 94% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
45 family medicine physician records list a practice address in Los Gatos
They are 45 of the 1,905 NPPES records with a practice address in Los Gatos, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Los Gatos → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- William Broad, MDLos Gatos, CA 950321750374591
- Tiffany Davies, M.D.Los Gatos, CA 950321386754133
- Mary Defigard, MDLos Gatos, CA 950321710914791
- Dewey Duckham, M.D.Los Gatos, CA 950321356369508
- Timothy Jen, M.D.Los Gatos, CA 950321013944628
- Neeraj Kochhar, MDLos Gatos, CA 950321033180294
- Thao Nguyen, MDLos Gatos, CA 950321619909975
- Arthur Polussa, M.D.Los Gatos, CA 950321629062021
Common questions
What is William S. Warshal, MD's NPI number?
William S. Warshal, MD's National Provider Identifier (NPI) is 1285620666, issued on Sep 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William S. Warshal, MD located?
The NPPES record lists a practice address at 15251 National Ave Ste 104, Los Gatos, CA, 95032. Phone: (408) 605-8612. Providers update this record themselves, so call before visiting.
How can I verify William S. Warshal, MD's license?
NPPES lists California license number G41468, 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 William S. Warshal, MD prescribe under Medicare Part D?
In 2024, William S. Warshal, MD had 1,399 Medicare Part D claims for 51 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.