DR. TAN THE NGUYEN (M.D.) – Internal Medicine Physician, NPI 1609839299
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 DR. TAN THE NGUYEN (M.D.)
508 S Brookhurst St
Anaheim, CA 92804
Phone: (800) 760-5520
Fax: (800) 760-5520
Type: Location
8700 Warner Ave Ste 270
Fountain Valley, CA 927083212
Phone: (800) 560-9999
Fax: (800) 391-4191
Type: Location
7514 Girard Ave
Suite 4
LA Jolla, CA 920375149
Phone: (858) 754-1114
Fax: (858) 228-9828
Type: Location
12865 MAIN ST STE 105
GARDEN GROVE, CA 928408205
Phone: (800) 760-5520
Fax: (800) 760-5520
Type: Mailing
508, South Brookhurst Street, Little Arabia, West Anaheim, Anaheim, Orange County, California, 92804, United States
ANAHEIM, CA 928042416
Phone: (800) 760-5520
Fax: (800) 760-5520
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $21.
Total Amount is formed as General ($21) + Research ($0) + Ownership ($0) = $21.
Last reported payment date: 2024-01-22 • Largest payer in this snapshot: ABBVIE INC. ($21).
Total Amount
$21
General + Research + Ownership
Payments
1
Total payment records
General Amount
$21
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-01-22
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $21 |
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: 2008-12-12
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 |
|---|---|---|---|---|
| I20081212000602 | 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 |
|---|---|---|---|---|
| 99457 | Management using the results of remote vital sign monitoring per calendar month, first 20 minutes | 68 | 12 | $0 |
| 99454 | Remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days | 60 | 11 | $0 |
Insurance plans in this area (ZIP 92804)
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