Tammy Nguyen, PA-C
NPI 1326682428 · Physician Assistant · Los Alamitos, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tammy Nguyen, PA-C is a Physician Assistant provider in Los Alamitos, CA (NPI 1326682428).
Provider details
- NPI number
- 1326682428
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- Yes
- License
- 59081 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
382 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 174 | $82 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 121 | $118 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 25 | $13 |
| Urinalysis, Manual Test81002 | 19 | $3 |
| Administration of Influenza Virus VaccineG0008 | 16 | $35 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 48 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 70 | 32 |
| Amlodipine Besylate | 60 | 24 |
| Losartan Potassium | 54 | 21 |
| Lisinopril | 53 | 19 |
| Atorvastatin Calcium | 49 | 24 |
| Alendronate Sodium | 45 | 21 |
| Gabapentin | 43 |
Practice location
Mailing address
Additional practice locations (1)
- 1125 E 17th St Ste N452Santa Ana, CA 92701-2270Phone: (714) 597-7214Fax: (714) 727-3290
Registry dates
- Enumerated
- 2019-10-31
- Last updated
- 2025-11-24
- Certified
- 2025-11-24
Frequently asked questions
- What is Tammy Nguyen's NPI number?
- Tammy Nguyen's National Provider Identifier (NPI) is 1326682428, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tammy Nguyen's specialty?
- Tammy Nguyen is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Tammy Nguyen located?
- Tammy Nguyen's practice location on file with NPPES is 3460 Katella Ave, Los Alamitos, CA 90720-2334.
- What is Tammy Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Tammy Nguyen is (562) 594-6599.
- Does Tammy Nguyen accept Medicare?
- Tammy Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tammy Nguyen's NPI active?
- Yes — Tammy Nguyen's NPI (1326682428) is active in the NPPES registry as of the last update on 2025-11-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.