James D. Simpson, MD
Vascular Surgery Physician · Riverside, CA
James D. Simpson, MD is a vascular surgery physician with a practice address in Riverside, California, and NPI 1598813396, issued on Jan 8, 2007. Check the license (California G20839, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- James D. Simpson
- Credential
- MD
- Primary taxonomy
- Vascular Surgery Physician 2086S0129X
- License number
- G20839 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10800 Magnolia Ave, Riverside, CA 92505
- Phone
- (909) 353-2000
- Enumerated
- Jan 8, 2007
- Record last updated
- May 12, 2020 (not updated in 6 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest vascular surgery physician records → All 580 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.
- Joseph Abapo, MDPediatrics Physician1841348786
- Hussein Abdulrassoul, MDOrthopaedic Surgery Physician1972123891
- Kimberly Adams, PA-CMedical Physician Assistant1053522870
- Alfredo Aguiar, PAPhysician Assistant1043368970
- Michael Aguinaldo, M.D.Pediatrics Physician1851531487
- Maria Aguirre, MDPediatrics Physician1295806255
Verify James D. Simpson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G20839Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
James D. Simpson among 580 vascular surgery physician records in California
James D. Simpson, MD is one of 580 vascular surgery physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 40% newer
- In a Medicare fileNo · 84% of these records are
- In the CMS Doctors and Clinicians fileNo · 71% of these records are
- Record last updated2020 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086S0129X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Vascular Surgery Physician providers in California
There are 580 vascular surgery physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 580 in California → Every provider in Riverside → Vascular Surgery Physician nationwide →
The 8 vascular surgery physician records with the nearest ZIP codes
- Simpledeep Banipal, M.D.Riverside, CA 925051306181375
- Brian Campbell, MDRiverside, CA 925051861541153
- Mark Janzen, MDRiverside, CA 925051932329265
- Sung Kim, M.D.Riverside, CA 925051366452245
- Yiik Law, MDRiverside, CA 925051578763926
- Franklin Torres, M.D.Riverside, CA 925051114147592
- Shauna Trinh, M.D.Riverside, CA 925051194250431
- Xiu-Jie Wang, M.D.Riverside, CA 925051215135496
Common questions
What is James D. Simpson, MD's NPI number?
James D. Simpson, MD's National Provider Identifier (NPI) is 1598813396, issued on Jan 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is James D. Simpson, 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 James D. Simpson, MD's license?
NPPES lists California license number G20839, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.