Tan The Nguyen, M.D.
Internal Medicine Physician · Garden Grove, CA
Tan The Nguyen, M.D. is an internal medicine physician with a practice address in Garden Grove, California, and NPI 1609839299, issued on Apr 6, 2006. Check the license (California G67119, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tan The Nguyen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G67119 CA
Self-reported in NPPES; status is on the state search - Practice location
- 12865 Main St Ste 105, Garden Grove, CA 92840
- Phone
- (800) 768-1977
- Enumerated
- Apr 6, 2006
- Record last updated
- Jul 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (800) 768-1977
- Medicare enrollment
- Enrolled (PECOS I20081212000602); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 12865 Main St Ste 105
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Yuri Kim, FNPNurse Practitioner1942939293
- Gia NguyenPhysician Assistant1528741691
- Kimoanh NguyenNurse Practitioner1801556188
- Lily Nguyen, DNP, APRN, FNP-CFamily Nurse Practitioner1235834722
- Hiba ShakeelFamily Nurse Practitioner1154927739
Verify Tan The Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G67119Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,465 Medicare Part D claims for 192 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 26 claims were for opioids.
Most prescribed
- Atorvastatin Calcium181 claims
- Amlodipine Besylate108 claims
- Gabapentin94 claims
- Metformin Hcl75 claims
- Losartan Potassium66 claims
- Mirtazapine58 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 26.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $21.00
1 payment: food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Tan The Nguyen among 17,696 internal medicine physician records in California
Tan The Nguyen, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1988 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
39 internal medicine physician records list a practice address in Garden Grove
They are 39 of the 4,572 NPPES records with a practice address in Garden Grove, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Garden Grove → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Negin Behazin, MDGarden Grove, CA 928401497076301
- Bryan Choi, MDGarden Grove, CA 928401255525499
- Danh Dan, M.D.Garden Grove, CA 928401790917631
- Edward Ko, M.D.Garden Grove, CA 928401396911798
- Adriana Longo, M.D.Garden Grove, CA 928401124004999
- Benjamin Navarro, M.D.Garden Grove, CA 928401033208608
- Tam Nguyen, M.D.Garden Grove, CA 928401720153182
- Nga Nguyen, M.D.Garden Grove, CA 928401346447984
Common questions
What is Tan The Nguyen, M.D.'s NPI number?
Tan The Nguyen, M.D.'s National Provider Identifier (NPI) is 1609839299, issued on Apr 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Tan The Nguyen, M.D. located?
The NPPES record lists a practice address at 12865 Main St Ste 105, Garden Grove, CA, 92840. Phone: (800) 768-1977. Providers update this record themselves, so call before visiting.
How can I verify Tan The Nguyen, M.D.'s license?
NPPES lists California license number G67119, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Tan The Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Tan The Nguyen, M.D. had 2,465 Medicare Part D claims for 192 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Tan The Nguyen, M.D.'s MIPS final score?
The 2023 MIPS final score is 26.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.