Robert Johnson, M.D.
Robert Johnson, M.D. is a Therapeutic Radiology Physician in San Luis Obispo, CA, registered under NPI 1598942781.
Getting there
The practice address on file is 100 CASA ST STE C, San Luis Obispo, CA 93405. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| A121032 | CA | Therapeutic Radiology Physician primary |
This provider holds licence A121032 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Radiation Oncology
- PAC ID
- 9830355064
- Enrollment ID
- I20120716000466
Medicare enrolment is recorded as approved under the provider type Practitioner - Radiation Oncology. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Therapeutic Radiology covers
Therapeutic Radiology certificate name was changed to Radiation Oncology. Use Radiation Oncology. NUCC Health Care Provider Taxonomy, code 2085R0203X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1598942781 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 30, 2008 |
| Last updated | Oct 21, 2022 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
100 CASA ST STE C San Luis Obispo, CA 93405 (805) 541-1932 Fax (805) 541-1653 |
| Other identifiers |
1598942781
· Medicaid (CA) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 5 | 9 | 8 | 9 | 4 | 2 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 9 | 8 | 9 | 4 | 4 | 7 | 7 |
Sum = 79 · next multiple of 10 = 80 · check digit = 1 · actual last digit = 1
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.