Ralph Koenker, M.D.
Ralph Koenker, M.D. is a Diagnostic Radiology Physician in Novato, CA, registered under NPI 1891734265. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 180 ROWLAND WAY, Novato, CA 94945. 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 |
|---|---|---|
| G60981 | CA | Diagnostic Radiology Physician primary |
| G60981 | CA | Vascular & Interventional Radiology… |
| G60981 | CA | Neuroradiology Physician |
This provider holds licence G60981 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
- 4789582909
- Enrollment ID
- I20060209000255
Medicare enrolment is recorded as approved under the provider type Practitioner - Diagnostic Radiology. 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 Diagnostic Radiology covers
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease. NUCC Health Care Provider Taxonomy, code 2085R0202X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2085R0202X | Diagnostic Radiology Physician Diagnostic Radiology | G60981 | CA | primary |
| 2085R0204X | Vascular & Interventional Radiology Physician Vascular & Interventional Radiology | G60981 | CA | |
| 2085N0700X | Neuroradiology Physician Neuroradiology | G60981 | 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 | 1891734265 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 4, 2006 |
| Last updated | Mar 7, 2012 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
180 ROWLAND WAY Novato, CA 94945 (415) 290-1500 |
| Mailing address |
PO BOX 6102 Novato, CA 94948 |
| Other identifiers |
00G609810
· Medicaid (CA) 300121787 · Other (CA) 00G609810 · Other (CA) 300035771 · 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 | 8 | 9 | 1 | 7 | 3 | 4 | 2 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 9 | 1 | 5 | 3 | 8 | 2 | 3 |
Sum = 65 · next multiple of 10 = 70 · check digit = 5 · actual last digit = 5
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.