Stephen Simon, MD
NPI 1285618389 · Diagnostic Radiology Physician · Mission Viejo, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Simon, MD is a Diagnostic Radiology Physician provider in Mission Viejo, CA (NPI 1285618389).
Provider details
- NPI number
- 1285618389
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G50753 (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
20 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
- 2005-12-01
- Last updated
- 2007-11-30
Frequently asked questions
- What is Stephen Simon's NPI number?
- Stephen Simon's National Provider Identifier (NPI) is 1285618389, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Simon's specialty?
- Stephen Simon is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Simon located?
- Stephen Simon's practice location on file with NPPES is 27700 Medical Center Rd, Mission Viejo, CA 92691-6426.
- What is Stephen Simon's phone number?
- The practice phone number listed in the NPPES registry for Stephen Simon is (949) 364-7744.
- Does Stephen Simon accept Medicare?
- Stephen Simon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Simon's NPI active?
- Yes — Stephen Simon's NPI (1285618389) is active in the NPPES registry as of the last update on 2007-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.