Tam Nguyen, M.D.
NPI 1093929697 · Family Medicine Physician · Union City, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tam Nguyen, M.D. is a Family Medicine Physician provider in Union City, CA (NPI 1093929697).
Provider details
- NPI number
- 1093929697
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A96679 (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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
3,039 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 | 875 | $154 |
| Advance Care Planning, First 30 Minutes99497 | 338 | $95 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 302 | $24 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 295 | $157 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 172 | $19 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 133 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 894 | 304 |
| Losartan Potassium | 581 | 194 |
| Amlodipine Besylate | 519 | 189 |
| Metformin Hcl | 373 | 128 |
| Alendronate Sodium | 295 | 106 |
| Lisinopril | 277 | 86 |
| Tamsulosin Hcl | 214 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$87 across 4 records (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
Registry dates
- Enumerated
- 2007-05-10
- Last updated
- 2015-09-16
Frequently asked questions
- What is Tam Nguyen's NPI number?
- Tam Nguyen's National Provider Identifier (NPI) is 1093929697, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tam Nguyen's specialty?
- Tam Nguyen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tam Nguyen located?
- Tam Nguyen's practice location on file with NPPES is 33077 Alvarado Niles Rd, Union City, CA 94587-3109.
- What is Tam Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Tam Nguyen is (510) 248-1018.
- Does Tam Nguyen accept Medicare?
- Tam Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tam Nguyen's NPI active?
- Yes — Tam Nguyen's NPI (1093929697) is active in the NPPES registry as of the last update on 2015-09-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.