William W. Winternitz, MD
Orthopaedic Surgery Physician · Poway, CA
William W. Winternitz, MD is an orthopaedic surgery physician with a practice address in Poway, California, and NPI 1083676639, issued on Apr 6, 2006. Check the license (California G51348, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William W. Winternitz
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- G51348 CA
Self-reported in NPPES; status is on the state search - Practice location
- 12630 Monte Vista RD, Poway, CA 92064
- Phone
- (858) 487-6440
- Enumerated
- Apr 6, 2006
- Record last updated
- Mar 10, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (858) 487-7281
- Medicaid ID
- OOG513980 CA
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 12630 Monte Vista RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Helena Jayasuriya, L.C.S.W.Clinical Social Worker1700119880
- Jayma Kim, M.F.T.Marriage & Family Therapist1447467212
- Jennifer Macewan, M.D.Otolaryngology Physician1336382019
Verify William W. Winternitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G51348Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
38 Medicare Part D claims, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D.
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 W. Winternitz among 2,276 orthopaedic surgery physician records in California
William W. Winternitz, MD is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2017 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in California
There are 2,276 orthopaedic surgery physician records in California.
All 2,276 in California → Every provider in Poway → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Philip Balikian, M.D.Poway, CA 920641407803687
- Philip Bohart, M.DPoway, CA 920641033223425
- James Bried, M.D.Poway, CA 920641891809257
- Brad Cohen, M.D.Poway, CA 920641164536538
- James Marino, M.D.Poway, CA 920641033293840
- Paul Milling, MDPoway, CA 920641609864834
- Brooke Ballard, M.D.San Marcos, CA 920691841447950
- Erin Farrelly, M.D., M.S.San Marcos, CA 920691922354422
Common questions
What is William W. Winternitz, MD's NPI number?
William W. Winternitz, MD's National Provider Identifier (NPI) is 1083676639, issued on Apr 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William W. Winternitz, MD located?
The NPPES record lists a practice address at 12630 Monte Vista RD, Poway, CA, 92064. Phone: (858) 487-6440. Providers update this record themselves, so call before visiting.
How can I verify William W. Winternitz, MD's license?
NPPES lists California license number G51348, 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 W. Winternitz, MD prescribe under Medicare Part D?
In 2024, William W. Winternitz, MD had 38 Medicare Part D claims; the average among orthopaedic surgery physician prescribers was 346. 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.