Sean Johnston, M.D., PH.D.
Sean Johnston, M.D., PH.D. is a Vascular & Interventional Radiology Physician in Santa Ana, CA, registered under NPI 1477581866. This provider registers 8 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 2414 S FAIRVIEW ST STE 202B, Santa Ana, CA 92704. 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 |
|---|---|---|
| A73716 | CA | Vascular & Interventional Radiology… primary |
| A73716 | CA | Therapeutic Radiology Physician |
| A73716 | CA | Diagnostic Radiology Physician |
| A73716 | CA | Body Imaging Physician |
| A73716 | CA | Neuroradiology Physician |
| 49574 | CA | Magnetic Resonance Imaging Radiologic… |
| A73716 | CA | Pediatric Radiology Physician |
| A73716 | CA | Diagnostic Ultrasound Physician |
This provider holds licence A73716 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 - Diagnostic Radiology
- PAC ID
- 0547152340
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| California | I20040326000662 | Practitioner - Diagnostic Radiology |
| Michigan | I20200303002514 | Practitioner - Diagnostic Radiology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Diagnostic Radiology. There are 2 separate enrolment records across 2 states (CA, MI). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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 Vascular & Interventional Radiology covers
A radiologist who diagnoses and treats diseases by various radiologic imaging modalities. These include fluoroscopy, digital radiography, computed tomography, sonography and magnetic resonance imaging. NUCC Health Care Provider Taxonomy, code 2085R0204X
All registered taxonomy codes
This provider registers 8 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2085R0204X | Vascular & Interventional Radiology Physician Vascular & Interventional Radiology | A73716 | CA | primary |
| 2085R0203X | Therapeutic Radiology Physician Therapeutic Radiology | A73716 | CA | |
| 2085R0202X | Diagnostic Radiology Physician Diagnostic Radiology | A73716 | CA | |
| 2085B0100X | Body Imaging Physician Body Imaging | A73716 | CA | |
| 2085N0700X | Neuroradiology Physician Neuroradiology | A73716 | CA | |
| 2471M1202X | Magnetic Resonance Imaging Radiologic Technologist Magnetic Resonance Imaging | 49574 | CA | |
| 2085P0229X | Pediatric Radiology Physician Pediatric Radiology | A73716 | CA | |
| 2085U0001X | Diagnostic Ultrasound Physician Diagnostic Ultrasound | A73716 | CA |
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 | 1477581866 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 28, 2006 |
| Last updated | May 18, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D., PH.D. |
| Practice address |
2414 S FAIRVIEW ST STE 202B Santa Ana, CA 92704 (805) 300-6761 |
| Mailing address |
631 COUNTRY CLUB DR Burbank, CA 91501 |
| Other identifiers |
A73716
· Other (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 | 4 | 7 | 7 | 5 | 8 | 1 | 8 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 5 | 7 | 1 | 8 | 2 | 8 | 3 |
Sum = 64 · next multiple of 10 = 70 · check digit = 6 · actual last digit = 6
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.