Thomas Nguyen, MD
NPI 1336272871 · Internal Medicine Physician · San Luis Obispo, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Nguyen, MD is a Internal Medicine Physician provider in San Luis Obispo, CA (NPI 1336272871).
Provider details
- NPI number
- 1336272871
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A97300 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,076 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 706 | $134 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 170 | $95 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 135 | $136 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 30 | $96 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 24 | $180 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 131 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 607 | 178 |
| Levothyroxine Sodium | 320 | 87 |
| Amlodipine Besylate | 297 | 83 |
| Metformin Hcl | 276 | 82 |
| Valsartan | 269 | 79 |
| Rosuvastatin Calcium | 238 | 71 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$19 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 300 Canal StKing City, CA 93930-3431Phone: (303) 390-1940
- 350 S Oak AveOakdale, CA 95361-3519Phone: (303) 390-1940
Registry dates
- Enumerated
- 2007-03-13
- Last updated
- 2025-05-20
- Certified
- 2025-05-20
Frequently asked questions
- What is Thomas Nguyen's NPI number?
- Thomas Nguyen's National Provider Identifier (NPI) is 1336272871, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Nguyen's specialty?
- Thomas Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Nguyen located?
- Thomas Nguyen's practice location on file with NPPES is 892 Aerovista Pl Ste 210, San Luis Obispo, CA 93401-8054.
- What is Thomas Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Thomas Nguyen is (805) 549-8023.
- Does Thomas Nguyen accept Medicare?
- Thomas Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Nguyen's NPI active?
- Yes — Thomas Nguyen's NPI (1336272871) is active in the NPPES registry as of the last update on 2025-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.