James Simpson, MD
NPI 1598813396 · Vascular Surgery Physician · Riverside, CA
Enrolled with Medicare as Practitioner - Vascular Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Simpson, MD is a Vascular Surgery Physician provider in Riverside, CA (NPI 1598813396).
Provider details
- NPI number
- 1598813396
- Entity type
- Individual
- Primary specialty
- Vascular Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G20839 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-08
- Last updated
- 2020-05-12
- Certified
- 2020-05-12
Frequently asked questions
- What is James Simpson's NPI number?
- James Simpson's National Provider Identifier (NPI) is 1598813396, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Simpson's specialty?
- James Simpson is listed in the NPPES registry with a primary specialty of Vascular Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is James Simpson located?
- James Simpson's practice location on file with NPPES is 10800 Magnolia Ave, Riverside, CA 92505-3043.
- What is James Simpson's phone number?
- The practice phone number listed in the NPPES registry for James Simpson is (909) 353-2000.
- Does James Simpson accept Medicare?
- James Simpson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Simpson's NPI active?
- Yes — James Simpson's NPI (1598813396) is active in the NPPES registry as of the last update on 2020-05-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.