J Duc Ngoc Nguyen, M.D.
Internal Medicine Physician · Fontana, CA
J Duc Ngoc Nguyen, M.D. is an internal medicine physician with a practice address in Fontana, California, and NPI 1427018456, issued on Mar 24, 2006. Check the license (California A62436, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- J Duc Ngoc Nguyen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A62436 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8110 Mango Ave, Fontana, CA 92335
- Phone
- (909) 822-1164
- Enumerated
- Mar 24, 2006
- Record last updated
- May 5, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (909) 357-2235
- Medicaid ID
- 00624360 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 8110 Mango Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify J Duc Ngoc Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A62436Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.1 times the Medicare Part D claims of the average internal medicine physician in 2024
13,133 Medicare Part D claims for 742 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 594 claims were for opioids.
Most prescribed
- Atorvastatin Calcium699 claims
- Ibuprofen610 claims
- Metformin Hcl593 claims
- Lisinopril444 claims
- Amlodipine Besylate358 claims
- Hydrocodone-Acetaminophen349 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.
J Duc Ngoc Nguyen among 17,696 internal medicine physician records in California
J Duc Ngoc 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 fileNo · 63% of these records are
- Record last updated2014 · 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).
111 internal medicine physician records list a practice address in Fontana
They are 111 of the 3,012 NPPES records with a practice address in Fontana, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Fontana → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Te-Ie Lee, M.D.Fontana, CA 923351982613931
- Hollis Lee, MDFontana, CA 923351588736060
- Hoveda Mufti, M.D.Fontana, CA 923351598871493
- Joseph Paredes, MDFontana, CA 923351457422420
- Ramesh Patel, MDFontana, CA 923351750480810
- Alex Quan, MDFontana, CA 923351659442630
- Gregory Shimizu, MDFontana, CA 923351154492130
- Lilybeth Sistoza, MDFontana, CA 923351538172358
Common questions
What is J Duc Ngoc Nguyen, M.D.'s NPI number?
J Duc Ngoc Nguyen, M.D.'s National Provider Identifier (NPI) is 1427018456, issued on Mar 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is J Duc Ngoc Nguyen, M.D. located?
The NPPES record lists a practice address at 8110 Mango Ave, Fontana, CA, 92335. Phone: (909) 822-1164. Providers update this record themselves, so call before visiting.
How can I verify J Duc Ngoc Nguyen, M.D.'s license?
NPPES lists California license number A62436, 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 J Duc Ngoc Nguyen, M.D. prescribe under Medicare Part D?
In 2024, J Duc Ngoc Nguyen, M.D. had 13,133 Medicare Part D claims for 742 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.