William Spencer Lewis, MD
Otolaryngology Physician · Los Gatos, CA
William Spencer Lewis, MD is an otolaryngology physician with a practice address in Los Gatos, California, and NPI 1871585059, issued on Aug 16, 2005. Check the license (California G62557, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Spencer Lewis
- Credential
- MD
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- G62557 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15861 Winchester Blvd, Los Gatos, CA 95030
- Phone
- (408) 395-6121
- Enumerated
- Aug 16, 2005
- Record last updated
- Apr 29, 2024
- Fax
- (408) 395-6127
- Medicaid ID
- 00G625571 CA
- Medicare enrollment
- Enrolled (PECOS I20100825000896); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1986
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 1,212 in California → Look up another NPI →
Also registered at 15861 Winchester Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Arnstein, MDOtolaryngology Physician1801898796
- Harsha JohnAudiologist1285033936
- Rom Karin, MDOtolaryngology Physician1871595223
Verify William Spencer Lewis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G62557Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% more Medicare Part D claims than the average otolaryngology physician in 2024
564 Medicare Part D claims for 262 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Fluticasone Propionate119 claims
- Ipratropium Bromide40 claims
- Azelastine Hcl39 claims
- Fluocinolone Acetonide Oil38 claims
- Omeprazole36 claims
- Prednisone28 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.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
William Spencer Lewis among 1,212 otolaryngology physician records in California
William Spencer Lewis, MD is one of 1,212 otolaryngology physician records with a practice address in California. 80% 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, 93% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated1986 · median 2004 among the 818 with a school on file
- Record last updated2024 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in California
There are 1,212 otolaryngology physician records in California.
All 1,212 in California → Every provider in Los Gatos → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- David Arnstein, MDLos Gatos, CA 950301801898796
- Rom Karin, MDLos Gatos, CA 950301871595223
- Philip Ho, M.D.Los Gatos, CA 950321760579718
- George Shoptaw, M.D.Los Gatos, CA 950321043243058
- Todd Dray, MDSanta Clara, CA 950511083791917
- Michael Friduss, MDSanta Clara, CA 950511265519193
- J. Richard Gaskill, MDSanta Clara, CA 950511053498998
- Richard Gunsalus, MDSanta Clara, CA 950511700963659
Common questions
What is William Spencer Lewis, MD's NPI number?
William Spencer Lewis, MD's National Provider Identifier (NPI) is 1871585059, issued on Aug 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William Spencer Lewis, MD located?
The NPPES record lists a practice address at 15861 Winchester Blvd, Los Gatos, CA, 95030. Phone: (408) 395-6121. Providers update this record themselves, so call before visiting.
How can I verify William Spencer Lewis, MD's license?
NPPES lists California license number G62557, 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 Spencer Lewis, MD prescribe under Medicare Part D?
In 2024, William Spencer Lewis, MD had 564 Medicare Part D claims for 262 beneficiaries; the average among otolaryngology physician prescribers was 541. 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.