Robert Johnson, M.D.
NPI 1598942781 · Therapeutic Radiology Physician · San Luis Obispo, CA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Johnson, M.D. is a Therapeutic Radiology Physician provider in San Luis Obispo, CA (NPI 1598942781).
Provider details
- NPI number
- 1598942781
- Entity type
- Individual
- Primary specialty
- Therapeutic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A121032 (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
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
5,565 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) |
|---|---|---|
| Intensity Modulated Treatment Delivery, Single Or Multiple Fields/Arcs,via Narrow Spatially and Temporally Modulated Beams, Binary, Dynamic Mlc, Per Treatment SessionG6015 | 1,253 | $405 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 950 | $132 |
| Radiation Treatment Delivery,3 Or More Separate Treatment Areas, Custom Blocking, Tangential Ports, Wedges, Rotational Beam, Compensators, Electron Beam; 6-10 MevG6012 | 434 | $262 |
| Continuing Radiation Therapy Consultation Per Week77336 | 394 | $100 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 354 | $199 |
| Calculation of Radiation Therapy Dose77300 | 343 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-01-30
- Last updated
- 2022-10-21
- Certified
- 2022-10-21
Frequently asked questions
- What is Robert Johnson's NPI number?
- Robert Johnson's National Provider Identifier (NPI) is 1598942781, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Johnson's specialty?
- Robert Johnson is listed in the NPPES registry with a primary specialty of Therapeutic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Johnson located?
- Robert Johnson's practice location on file with NPPES is 100 Casa St Ste C, San Luis Obispo, CA 93405-8804.
- What is Robert Johnson's phone number?
- The practice phone number listed in the NPPES registry for Robert Johnson is (805) 541-1932.
- Does Robert Johnson accept Medicare?
- Robert Johnson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Johnson's NPI active?
- Yes — Robert Johnson's NPI (1598942781) is active in the NPPES registry as of the last update on 2022-10-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.