PAULSON-CHEN MEDICAL ASSOCIATES, PC
PAULSON-CHEN MEDICAL ASSOCIATES, PC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1639582471, based in Diamond Bar, CA. The organization lists 4 taxonomy classifications, with General Practice Physician recorded as primary.
Getting there
The practice address on file is 1470 VALLEY VISTA DR STE 104, Diamond Bar, CA 91765. 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 |
|---|---|---|
| 20A13403 | CA | General Practice Physician primary |
| DC30668 | CA | Chiropractor |
| PT37454 | CA | Physical Therapist |
| PA17449 | CA | Medical Physician Assistant |
This provider holds licence 20A13403 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 General Practice covers
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions. NUCC Health Care Provider Taxonomy, code 208D00000X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 208D00000X | General Practice Physician | 20A13403 | CA | primary |
| 111N00000X | Chiropractor | DC30668 | CA | |
| 225100000X | Physical Therapist | PT37454 | CA | |
| 363AM0700X | Medical Physician Assistant Medical | PA17449 | 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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1639582471 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Jun 10, 2014 |
| Last updated | Jan 16, 2026 |
| Status | Active |
| Practice address |
1470 VALLEY VISTA DR STE 104 Diamond Bar, CA 91765 (909) 468-2192 |
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 | 6 | 3 | 9 | 5 | 8 | 2 | 4 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 6 | 9 | 1 | 8 | 4 | 4 | 5 |
Sum = 69 · next multiple of 10 = 70 · 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.