PAUL C. TSAI M.D. & DOLORES O. TAN INC.
PAUL C. TSAI M.D. & DOLORES O. TAN INC. is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1992897946, based in Merced, CA. The organization lists 2 taxonomy classifications, with Obstetrics & Gynecology Physician recorded as primary.
Getting there
The practice address on file is 700 W OLIVE AVE STE D, Merced, CA 95348. 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 |
|---|---|---|
| A33774 | CA | Obstetrics & Gynecology Physician primary |
| A34561 | CA | Pediatrics Physician |
This provider holds licence A33774 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 Obstetrics & Gynecology covers
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women. NUCC Health Care Provider Taxonomy, code 207V00000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207V00000X | Obstetrics & Gynecology Physician | A33774 | CA | primary |
| 208000000X | Pediatrics Physician | A34561 | 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 | 1992897946 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Sep 28, 2006 |
| Last updated | Jul 8, 2015 |
| Status | Active |
| Practice address |
700 W OLIVE AVE STE D Merced, CA 95348 (209) 383-5291 |
| Other identifiers |
00A337740
· Medicaid (CA) 00A345610 · Medicaid (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 | 9 | 9 | 2 | 8 | 9 | 7 | 9 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 9 | 2 | 7 | 9 | 5 | 9 | 8 |
Sum = 84 · next multiple of 10 = 90 · 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.