Walter Olsen, MD
Walter Olsen, MD is a Neuroradiology Physician in San Diego, CA, registered under NPI 1720051485.
Getting there
The practice address on file is 200 W ARBOR DR, San Diego, CA 92103. 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 |
|---|---|---|
| G55091 | CA | Neuroradiology Physician primary |
This provider holds licence G55091 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Neuroradiology covers
A radiologist who diagnoses and treats diseases utilizing imaging procedures as they relate to the brain, spine and spinal cord, head, neck and organs of special sense in adults and children. NUCC Health Care Provider Taxonomy, code 2085N0700X
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 | 1720051485 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 10, 2006 |
| Last updated | Sep 19, 2019 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
200 W ARBOR DR San Diego, CA 92103 (800) 926-8273 |
| Mailing address |
PO BOX 232410 San Diego, CA 92193 |
| Other identifiers |
GR0083811
(CA) GR0083815 (CA) ZZZ75341Z (CA) GR0083810 (CA) GR0083814 (CA) GR0083812 (CA) GR0083813 (CA) GR0083816 (CA) GR0083817 (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 | 7 | 2 | 0 | 0 | 5 | 1 | 4 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 4 | 0 | 0 | 5 | 2 | 4 | 7 |
Sum = 55 · next multiple of 10 = 60 · 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.