Thomas Buchanan, M.D.
NPI 1003143991 · Internal Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Order and Referring Only - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Buchanan, M.D. is a Internal Medicine Physician provider in Los Angeles, CA (NPI 1003143991).
Provider details
- NPI number
- 1003143991
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- C42204 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-11-12
- Last updated
- 2009-11-12
Frequently asked questions
- What is Thomas Buchanan's NPI number?
- Thomas Buchanan's National Provider Identifier (NPI) is 1003143991, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Buchanan's specialty?
- Thomas Buchanan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Buchanan located?
- Thomas Buchanan's practice location on file with NPPES is 1500 San Pablo St, Los Angeles, CA 90033-5313.
- What is Thomas Buchanan's phone number?
- The practice phone number listed in the NPPES registry for Thomas Buchanan is (323) 442-9576.
- Does Thomas Buchanan accept Medicare?
- Thomas Buchanan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Buchanan's NPI active?
- Yes — Thomas Buchanan's NPI (1003143991) is active in the NPPES registry as of the last update on 2009-11-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.