THERESA THANH NGOC NGUYEN (M.D.) – Internal Medicine Physician, NPI 1003893801
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
21,511 INTERNAL MEDICINE in CA
Provider Addresses for THERESA THANH NGOC NGUYEN (M.D.)
15576 BROOKHURST ST STE B
WESTMINSTER, CA 926837586
Phone: (714) 775-8090
Fax: (714) 775-2998
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 102 Open Payments records for all available years, with a total value of $2,839.
Total Amount is formed as General ($2,839) + Research ($0) + Ownership ($0) = $2,839.
Last reported payment date: 2024-12-18 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($533).
Total Amount
$2,839
General + Research + Ownership
Payments
102
Total payment records
General Amount
$2,839
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-18
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AstraZeneca Pharmaceuticals LP | $533 |
| Amgen Inc. | $519 |
| ABBVIE INC. | $232 |
| Gilead Sciences, Inc. | $145 |
| GENZYME CORPORATION | $132 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2012-05-01
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20120501000264 | I | Internal Medicine | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 1,599 | 434 | $0 |
| 36415 | Insertion of needle into vein for collection of blood sample | 746 | 350 | $0 |
| 99490 | Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 695 | 136 | $0 |
| G0008 | Administration of influenza virus vaccine | 222 | 221 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 207 | 207 | $0 |
Insurance plans in this area (ZIP 92683)
Loading plans...
Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| INTERNAL MEDICINE | CA | 90670 | Pneumococcal vaccine for injection into muscle | 47 | 47 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| E N D O C R I N O L O G Y | CA | |
| Family Practice, Geriatric Medicine | CA | |
| Internal Medicine | CA | |
| Family Practice | CA | |
| Family Practice | CA | |
| Internal Medicine | CA | |
| Internal Medicine | CA | |
| Family Practice | CA | |
| Internal Medicine | CA | |
| Internal Medicine, Nephrology | CA |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.