Stephen G. Provonsha, MD
General Practice Physician · Riverside, CA
Stephen G. Provonsha, MD is a general practice physician with a practice address in Riverside, California, and NPI 1598836413, issued on Nov 13, 2006. Check the license (California G51217, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen G. Provonsha
- Credential
- MD
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- G51217 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10800 Magnolia Ave, Riverside, CA 92505
- Phone
- (909) 353-2000
- Enumerated
- Nov 13, 2006
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 1,956 in California → Look up another NPI →
Also registered at 10800 Magnolia Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Michael Aguinaldo, M.D.Pediatrics Physician1851531487
- Maria Aguirre, MDPediatrics Physician1295806255
Verify Stephen G. Provonsha in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G51217Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average general practice physician in 2024
206 Medicare Part D claims for 48 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Ozempic44 claims
- Levothyroxine Sodium30 claims
- Nano 2nd Gen Pen Needle26 claims
- Victoza 3-Pak25 claims
- Liraglutide17 claims
- Naltrexone Hcl11 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.
Stephen G. Provonsha among 1,956 general practice physician records in California
Stephen G. Provonsha, MD is one of 1,956 general practice physician records with a practice address in California. 48% 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, 66% newer
- In a Medicare fileYes · 48% of these records are
- In the CMS Doctors and Clinicians fileNo · 27% of these records are
- Record last updated2021 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Physician providers in California
There are 1,956 general practice physician records in California.
All 1,956 in California → Every provider in Riverside → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Dee Lim, MDRiverside, CA 925051295894889
- Cesar Reis, MDRiverside, CA 925051215255385
- Betina Gideon-Greer, M.D.Riverside, CA 925061316924582
- David Lee, M.D.Riverside, CA 925041013469683
- Joann Schneider, M.D.Riverside, CA 925061003157934
- Theodore Wyman, M.D.Riverside, CA 925061083926919
- David Farfan, MDRiverside, CA 925031255904496
- David Siegel, MDRiverside, CA 925031023881646
Common questions
What is Stephen G. Provonsha, MD's NPI number?
Stephen G. Provonsha, MD's National Provider Identifier (NPI) is 1598836413, issued on Nov 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen G. Provonsha, MD located?
The NPPES record lists a practice address at 10800 Magnolia Ave, Riverside, CA, 92505. Phone: (909) 353-2000. Providers update this record themselves, so call before visiting.
How can I verify Stephen G. Provonsha, MD's license?
NPPES lists California license number G51217, 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 Stephen G. Provonsha, MD prescribe under Medicare Part D?
In 2024, Stephen G. Provonsha, MD had 206 Medicare Part D claims for 48 beneficiaries; the average among general practice physician prescribers was 3,030. 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.