1. Home
  2. Directory
  3. California
  4. Garden Grove
  5. Internal Medicine
  6. NPI Profile

DR. TAN THE NGUYEN M.D.
NPI 1609839299
Internal Medicine in Garden Grove, CA

Active since April 06, 2006PECOS EnrolledAccepts Medicare Assignment
26.58/100
CMS Quality Rating
12865 MAIN ST STE 105, GARDEN GROVE, CA 92840(800) 768-1977(800) 768-1977 Get Directions Write a Review

NPPES record last updated: July 22, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 22, 2021, Jan 7, 2019 (2 updates tracked since 2019).

About Dr. Tan The Nguyen M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. TAN THE NGUYEN M.D. (NPI 1609839299) is an individual internal medicine provider in Garden Grove, California, licensed in California (G67119) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (1988).

NPPES Registry Identity

NPI1609839299
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. TAN THE NGUYENCredential: M.D.
Location Address12865 MAIN ST STE 105Garden Grove, CA 92840-8205
Mailing Address12865 Main St Ste 105Garden Grove, CA 92840-8205 · (800) 760-5520 · Fax (800) 760-5520
Phone(800) 768-1977
Fax(800) 768-1977
Sole ProprietorNo
Medical School CMSOtherGraduated 1988
Enumeration DateApril 6, 2006
Last NPPES UpdateJuly 22, 20212 updates tracked since enumeration
NPPES CertifiedJuly 22, 2021
✔ NPI 1609839299 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · G67119
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
12865 MAIN ST STE 105, Garden Grove, CA 92840
Open in Google Maps ↗

Other Names 1

Professional Name (2)Dr. Tony Nguyen M.d.

Secondary Practice Locations 3

Location 1508 S Brookhurst StAnaheim, CA 92804 · Phone (800) 760-5520 · Fax (800) 760-5520
Location 27514 Girard Ave, Suite 4LA Jolla, CA 92037-5149 · Phone (858) 754-1114 · Fax (858) 228-9828
Location 38700 Warner Ave Ste 270Fountain Valley, CA 92708-3212 · Phone (800) 560-9999 · Fax (800) 391-4191

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Tan The Nguyen M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7810995362
PECOS Enrollment IDI20081212000602
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

4

Medicare enrollment records show Tan Nguyen reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

House Call Medical Associates, Inc.
Same address
Geriatric Medicine
12865 MAIN ST STE 105
Garden Grove, CA 92840
  • Reassigned Medicare billing, California enrollment
  • 9 clinicians in this Medicare group
NPI 1548688732 (800) 560-9999
Ted Medical Group, Inc.
Same address
Internal Medicine
12865 MAIN ST STE 105
Garden Grove, CA 92840
  • Reassigned Medicare billing, California enrollment
  • 5 clinicians in this Medicare group
NPI 1497396451 (800) 560-9999
Knd Development 59 LLC
3.0 mi
Hospitalist
1901 N COLLEGE AVE
Santa Ana, CA 92706
  • Reassigned Medicare billing, California enrollment
  • 204 clinicians in this Medicare group
NPI 1740519081 (502) 596-7300
Nr Medical Associates
84 mi
Pulmonary Disease
302 WASHINGTON ST # 116
San Diego, CA 92103
  • Reassigned Medicare billing, California enrollment
  • 18 clinicians in this Medicare group
NPI 1649601113 (858) 754-1114

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92840 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

26.58/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality23.33
Improvement Activities0
Cost24.16

Referred Medical Equipment & Supplies CMS DME claims 11

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
8 suppliers22 claims54 services$5.61 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
7 suppliers18 claims20 services$1.07 avg. paid by Medicare
Enteral feeding supply kit; syringe fed, per day, includes but not limited to feeding/flushing syringe, administration set tubing, dressings, tape B4034
Other-Enteral and Parenteral · category OB006N
1 supplier15 claims450 services$2.55 avg. paid by Medicare
Enteral feeding supply kit; pump fed, per day, includes but not limited to feeding/flushing syringe, administration set tubing, dressings, tape B4035
Other-Enteral and Parenteral · category OB006N
4 suppliers14 claims381 services$4.00 avg. paid by Medicare
Enteral formula, nutritionally complete with intact nutrients, includes proteins, fats, carbohydrates, vitamins and minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4150
Other-Enteral and Parenteral · category OB006N
3 suppliers14 claims5,703 services$0.31 avg. paid by Medicare
Enteral formula, nutritionally complete, calorically dense (equal to or greater than 1.5 kcal/ml) with intact nutrients, includes proteins, fats, carbohydrates, vitamins and minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4152
Other-Enteral and Parenteral · category OB006N
1 supplier12 claims6,936 services$0.27 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 8

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

HIBA SHAKEEL
Nurse Practitioner (Family)
12865 MAIN ST STE 105
GARDEN GROVE, CA 92840
Orange County (949) 419-7278
LILY TRAM NGUYEN DNP, APRN, FNP-C
Nurse Practitioner (Family)
12865 MAIN ST STE 105
GARDEN GROVE, CA 92840
Orange County (800) 768-1977
TED MEDICAL GROUP, INC.
Internal Medicine
12865 MAIN ST STE 105
GARDEN GROVE, CA 92840
Orange County (800) 560-9999
GIA NGUYEN
Physician Assistant
12865 MAIN ST STE 105
GARDEN GROVE, CA 92840
Orange County (800) 560-9999
HOUSE CALL MEDICAL ASSOCIATES, INC.
Internal Medicine (Geriatric Medicine)
12865 MAIN ST STE 105
GARDEN GROVE, CA 92840
Orange County (800) 560-9999
KIMOANH THI NGUYEN
Nurse Practitioner
12865 MAIN ST STE 105
GARDEN GROVE, CA 92840
Orange County (800) 768-1977
DAT Q NGUYEN, MD, INC
Internal Medicine
12865 MAIN ST STE 105
GARDEN GROVE, CA 92840
Orange County (800) 560-9999
YURI KIM FNP
Nurse Practitioner
12865 MAIN ST STE 105
GARDEN GROVE, CA 92840
Orange County (657) 272-7877

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Tan Nguyen's NPI number?

The NPI number for Tan Nguyen is 1609839299. It was assigned to this individual provider in the NPPES registry on April 6, 2006. The provider is also known as Dr. Tony Nguyen M.D..

Where is Tan Nguyen located?

Tan Nguyen practices at 12865 Main St Ste 105, Garden Grove, CA 92840. The listed phone number is (800) 768-1977.

What is Tan Nguyen's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Tan Nguyen enrolled in Medicare?

Yes. Tan Nguyen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Tan Nguyen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Tan Nguyen reassigns Medicare benefits to 4 organizations: House Call Medical Associates, Inc. (Garden Grove, CA), Ted Medical Group, Inc. (Garden Grove, CA), Knd Development 59 LLC (Santa Ana, CA) and Nr Medical Associates (San Diego, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Tan Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Tan Nguyen was last updated on July 22, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.