Thomas Buchanan, M.D.
Thomas Buchanan, M.D. is an Internal Medicine Physician in Los Angeles, CA, registered under NPI 1003143991. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Los Angeles, based on OpenStreetMap data collected Sep 6, 2026. Parking is available about 759 ft away. There is EV charging 484 ft from the office — useful if you are driving in from out of town. The nearest transit stop is 360 ft away, served by LA-USC T4.
Getting here and what is nearby
Parking 161 ft ~1 min
Transit LA-USC T15 200 ft ~1 min
Transit LA-USC T3 324 ft ~2 min
Transit LA-USC T4 360 ft ~2 min
Restaurant Dunkin' 350 ft ~2 min
2200 East Trojan Way, Los Angeles 90033
Mo-Th 05:00-18:00; Fr 05:00-19:00; Sa 06:00-18:00; Su 06:00-16:00
EV charging 484 ft ~2 min
Parking 497 ft ~2 min
Hotel Hyatt House LA - University Medical Center 546 ft ~3 min
Restaurant Chipotle 533 ft ~3 min
Parking 759 ft ~3 min
Restaurant Panda Express 0.26 mi ~6 min
1969 Zonal Avenue, Los Angeles 90006
Mo-Fr 10:00-15:00
Gas station Chevron 0.41 mi ~9 min
Convenience 7-Eleven 0.43 mi ~9 min
Hotel Lincoln Park Motel 0.47 mi ~10 min
Hotel Lincoln Park Motel 0.47 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| C42204 | CA | Internal Medicine Physician primary |
| C42204 | CA | Endocrinology, Diabetes & Metabolism… |
This provider holds licence C42204 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 Internal Medicine covers
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs. NUCC Health Care Provider Taxonomy, code 207R00000X
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 | |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | C42204 | CA | primary |
| 207RE0101X | Endocrinology, Diabetes & Metabolism Physician Endocrinology, Diabetes & Metabolism | C42204 | 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 | 1003143991 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 12, 2009 |
| Last updated | Nov 12, 2009 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M.D. |
| Practice address |
1500 SAN PABLO ST 3 NORTH UNIVERSITY HOSPITAL Los Angeles, CA 90033 (323) 442-9576 |
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 | 0 | 0 | 3 | 1 | 4 | 3 | 9 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 4 | 6 | 9 | 9 |
Sum = 59 · next multiple of 10 = 60 · 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.