William R. Alex, MD
Surgery Physician · Riverside, CA
William R. Alex, MD is a surgery physician with a practice address in Riverside, California, and NPI 1558300681, issued on Jun 5, 2006. Check the license (California G86010, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William R. Alex
- Credential
- MD
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- G86010 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4000 14TH St, Riverside, CA 92501
- Phone
- (951) 682-2036
- Enumerated
- Jun 5, 2006
- Record last updated
- Mar 19, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (951) 682-2942
- Medicaid ID
- 00G860100 CA
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 3,118 in California → Look up another NPI →
Also registered at 4000 14TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Bartley, MD, PH.D.Clinical Genetics (M.D.) Physician1184620411
- Donald Blackman, MDInternal Medicine Physician1386687754
- Hilario Marilao, M.D.Specialist1568502425
- Norman Snyder, MDDiagnostic Radiology Physician1316948110
- Trinh Tang, MDInternal Medicine Physician1326014986
- Juanita Wielenga, CNMAdvanced Practice Midwife1982752895
Verify William R. Alex in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G86010Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 73 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
William R. Alex among 3,118 surgery physician records in California
William R. Alex, MD is one of 3,118 surgery physician records with a practice address in California. 75% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2010 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in California
There are 3,118 surgery physician records in California.
All 3,118 in California → Every provider in Riverside → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Elizabeth TranRiverside, CA 925011922794361
- Hakan Wahlstrom, M.D.Riverside, CA 925011801813688
- David Barton, MDRiverside, CA 925031457675001
- John Coon, M.D.Riverside, CA 925031225086861
- Dzuy Le, MDRiverside, CA 925031629006812
- Iden Andacheh, MDRiverside, CA 925041881888345
- Michael Chin, M.D.Riverside, CA 925041114012648
- Aras Emdadi, DORiverside, CA 925041477997336
Common questions
What is William R. Alex, MD's NPI number?
William R. Alex, MD's National Provider Identifier (NPI) is 1558300681, issued on Jun 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William R. Alex, MD located?
The NPPES record lists a practice address at 4000 14TH St, Riverside, CA, 92501. Phone: (951) 682-2036. Providers update this record themselves, so call before visiting.
How can I verify William R. Alex, MD's license?
NPPES lists California license number G86010, 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.
What is William R. Alex, MD's MIPS final score?
The 2023 MIPS final score is 73 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.