James Mason, MD
NPI 1902955818 · Radiation Oncology Physician · Wildomar, CA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Mason, MD is a Radiation Oncology Physician provider in Wildomar, CA (NPI 1902955818).
Provider details
- NPI number
- 1902955818
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G85713 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
656 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 271 | $129 |
| Intensity Modulated Treatment Delivery, Single Or Multiple Fields/Arcs,via Narrow Spatially and Temporally Modulated Beams, Binary, Dynamic Mlc, Per Treatment SessionG6015 | 203 | $392 |
| Continuing Radiation Therapy Consultation Per Week77336 | 54 | $98 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 52 | $198 |
| Calculation of Radiation Therapy Dose77300 | 41 | $71 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 35 |
Practice location
Mailing address
Additional practice locations (1)
- 6939 Palm CtRiverside, CA 92506-2815Phone: (951) 683-6771Fax: (951) 683-7450
Registry dates
- Enumerated
- 2007-01-09
- Last updated
- 2020-11-13
- Certified
- 2020-11-13
Frequently asked questions
- What is James Mason's NPI number?
- James Mason's National Provider Identifier (NPI) is 1902955818, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Mason's specialty?
- James Mason is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is James Mason located?
- James Mason's practice location on file with NPPES is 36450 Inland Valley Dr, Wildomar, CA 92595-9583.
- What is James Mason's phone number?
- The practice phone number listed in the NPPES registry for James Mason is (951) 696-0679.
- Does James Mason accept Medicare?
- James Mason is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Mason's NPI active?
- Yes — James Mason's NPI (1902955818) is active in the NPPES registry as of the last update on 2020-11-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.