Quick answers
- Does Thomas T. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas T. Nguyen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Thomas T. Nguyen see?
- In 2024, CMS data shows 486 Original Medicare patients and 4,810 services for Thomas T. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Thomas T. Nguyen's NPI number?
- 1336272871. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Thomas T. Nguyen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 486 |
|---|---|
| Services billed to Medicare | 4,810 |
| Different services or procedures | 41 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)706 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)170 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)135 services
- Telephone medical discussion with physician, 11-20 minutes (99442)30 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)24 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure70%
- Arthritis49%
- Ischemic heart disease31%
- Diabetes26%
- Anxiety24%
Hospitals where Thomas T. Nguyen works
Medicare's Facility Affiliation Data lists Thomas T. Nguyen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Adventist Health Sierra VistaSan Luis Obispo, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050506
- French Hospital Medical CenterSan Luis Obispo, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050232
- Marian Regional Medical CenterSanta Maria, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050107
Practice locations
Addresses where Thomas T. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 2020 Santa Monica Blvd, Suite 210Santa Monica, CA 90404 (310) 458‑2381
- 862 Aerovista Pl, Suite 100San Luis Obispo, CA 93401 (805) 549‑8023
- 892 Aerovista Pl, Suite 240San Luis Obispo, CA 93401 (805) 541‑8252
Group practices
Medicare enrollment lists Thomas T. Nguyen as a member of this group (CMS data updated October 2, 2026).
- The Regents of the University of California1,462 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Santa Monica
Clinicians with the same Medicare primary specialty in Santa Monica, CA — not a recommendation.
Other clinicians in The Regents of the University of California
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2003 (23 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1336272871 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians