Joseph Matthews, RDCS, RVT, RDMS, RPH
Joseph Matthews, RDCS, RVT, RDMS, RPH is a provider specialising in Vascular Sonography Radiologic Technologist in Watsonville, CA, registered under NPI 1437556156. 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 65 NIELSON ST, 101, Watsonville, CA 95076. 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 |
|---|---|---|
| 71989 | CA | Vascular Sonography Radiologic… primary |
| 71989 | CA | Sonography Radiologic Technologist |
| 71989 | CA | Cardiovascular Specialist/Technologist |
This provider holds licence 71989 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 Vascular Sonography covers
A radiologic technologist who specializes in vascular sonography and is trained in the use of ultrasound equipment to image veins and arteries, which health care providers use to diagnose and treat various vascular conditions. NUCC Health Care Provider Taxonomy, code 2471V0105X
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 | |
|---|---|---|---|---|
| 2471V0105X | Vascular Sonography Radiologic Technologist Vascular Sonography | 71989 | CA | primary |
| 2471S1302X | Sonography Radiologic Technologist Sonography | 71989 | CA | |
| 246X00000X | Cardiovascular Specialist/Technologist | 71989 | 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 | 1437556156 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 24, 2014 |
| Last updated | Jan 15, 2015 |
| Status | Active |
| Sole proprietor | No |
| Credential | RDCS, RVT, RDMS, RPH |
| Practice address |
65 NIELSON ST, 101 Watsonville, CA 95076 (408) 829-6486 Fax (408) 890-4770 |
| Mailing address |
PO BOX 4864 Mountain View, CA 94040 |
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 | 3 | 7 | 5 | 5 | 6 | 1 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 6 | 7 | 1 | 5 | 3 | 1 | 1 |
Sum = 54 · next multiple of 10 = 60 · 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.