Dr. J Duc Ngoc Nguyen, MD
- Medicare services, 2024
- 217
- Medicare patients, 2024
- 107
- Part D claims, 2024
- 13,133
- Industry payments
- $583
- Affiliated sites
- 2
- Practice address
- 8110 Mango Ave, Fontana, CA 92335-3603
- Practice phone
- Call (909) 427-1303
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Optum
Multi-specialty group site · Fontana, California
Find Dr. Nguyen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. J Duc Ngoc Nguyen is an internist in Fontana, California
Dr. Nguyen practices at Optum in Fontana, California.
Dr. Nguyen's NPI, 1427018456, was assigned on March 24, 2006. Dr. Nguyen graduated from University of Minnesota Medical School in 1995. Dr. Nguyen holds California license A62436.
- NPI
- 1427018456NPI Registry (opens in a new tab)
- NPI enumeration date
- March 24, 2006
- NPI status
- Active
- Practice phone
- (909) 427-1303
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. J Duc Ngoc Nguyen practices at Optum in Fontana, California
Dr. Nguyen's primary practice is Optum, at 8110 Mango Ave, Fontana, CA 92335-3603. The practice phone is (909) 427-1303.
- Optum8110 Mango Ave, Fontana, CA 92335-3603Phone(909) 427-1303
Source: Dmand AI Affiliation Data
Dr. J Duc Ngoc Nguyen is affiliated with 2 sites of care and 2 medical groups
Dr. Nguyen's primary practice is Optum in Fontana, California. The medical group on file is Optum (formerly Pinnacle Medical Group). Dmand AI also links Dr. Nguyen to 1 more group practice or clinic and 1 medical group, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. J Duc Ngoc Nguyen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nguyen practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Optum | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. J Duc Ngoc Nguyen is one of 16,751 internists in California
Internal medicine is Dr. Nguyen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Nguyen is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Nguyen
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. J Duc Ngoc Nguyen billed Medicare for 217 services in 2024
CMS data shows 217 Medicare services from Dr. Nguyen across 4 procedure codes in 2024, for 107 Medicare patients. Medicare paid $12,088 for them. Every service was in an office.
Dr. Nguyen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1852024: 15516%
- Tests and treatments
- 2023: 632024: 4922%
- Other services
- 2023: 02024: 13
Dr. Nguyen compared with the California median for internists, 2024
- Dr. Nguyen
- California median
- Medicare services
- 217vs 36140% below
- Medicare patients
- 107vs 15129% below
- Part D claims
- 12,341vs 42129.3 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Nguyen's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Nguyen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nguyen and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. J Duc Ngoc Nguyen treated 107 Medicare patients in 2024, average age 69
CMS counts 107 Medicare patients who saw Dr. Nguyen in 2024. The largest group is 65 to 74, with 55 patients. 68% of them have high blood pressure, and 65% have high cholesterol. 74% are also on Medicaid. Their average risk score is 1.50, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Nguyen's median patient age at 64, with 45% women.
Dr. Nguyen's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Nguyen's Medicare patients by sex, 2024
- Women5652%
- Men5148%
Chronic conditions among Dr. Nguyen's Medicare patients, 2024
- High blood pressure68%
- High cholesterol65%
- Diabetes40%
- Chronic kidney disease32%
- Arthritis21%
- Depression19%
- Mood disorders19%
- Anxiety18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nguyen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women45%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. J Duc Ngoc Nguyen wrote 13,133 Medicare Part D claims in 2024
In 2024, Dr. Nguyen wrote 13,133 Medicare Part D claims for 742 patients. 88% of them were for generic drugs. CMS names the drug for 12,341 of them, across 162 drugs with 11 or more claims each, at $657,132 in total drug cost. In 2023, CMS named 13,733 claims across 173 drugs.
Dr. Nguyen's Part D claims by kind of drug, 2024
- Generic11,613 claims88%
- Brand-name1,340 claims10%
- Other180 claims1%
Dr. Nguyen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Nguyen's Part D claims, 2024
- Opioids5%594 of 13,133 claims
- Antibiotics2%214 of 13,133 claims
- Antipsychotics, patients 65 and over0%46 of 13,133 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 13,7332024: 12,34110%
Drugs named by CMS: 162 in 2024, 173 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. J Duc Ngoc Nguyen received $583 in industry payments from 2016 to 2023
CMS Open Payments shows 35 general payments to Dr. Nguyen from 13 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 100% of the total. ITI, Inc. paid the most, $124.
General payments to Dr. Nguyen by program year, 2016 to 2023
Companies that paid Dr. Nguyen the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. J Duc Ngoc Nguyen graduated from University of Minnesota Medical School
Dr. Nguyen graduated from University of Minnesota Medical School in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. J Duc Ngoc Nguyen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. J Duc Ngoc Nguyen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. J Duc Ngoc Nguyen's NPI number?
Dr. J Duc Ngoc Nguyen's NPI number is 1427018456. It was assigned on March 24, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. J Duc Ngoc Nguyen?
Dr. J Duc Ngoc Nguyen is an internist in Fontana, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. J Duc Ngoc Nguyen practice?
Dr. Nguyen practices at 8110 Mango Ave, Fontana, CA 92335-3603. Dr. Nguyen's primary practice is Optum in Fontana, California. Dmand AI also links Dr. Nguyen to 1 group practice or clinic and 1 medical group.
What is Dr. J Duc Ngoc Nguyen's office phone number?
The practice phone on file for Dr. Nguyen is (909) 427-1303.
What is Dr. J Duc Ngoc Nguyen's medical license number?
Dr. Nguyen holds California license A62436.
What medical group is Dr. J Duc Ngoc Nguyen part of?
Dr. Nguyen is linked to Optum (formerly Pinnacle Medical Group). Dmand AI links Dr. Nguyen to 1 more medical group.
Does Dr. J Duc Ngoc Nguyen accept Medicare?
Yes. CMS data shows Dr. Nguyen billed Medicare for 217 services in 2024.
How many Medicare patients does Dr. J Duc Ngoc Nguyen see?
CMS counts 107 Medicare patients who saw Dr. Nguyen in 2024, with an average age of 69.
What services does Dr. J Duc Ngoc Nguyen bill to Medicare?
In 2024, Dr. Nguyen's most billed Medicare services were office visit, established patient (99214), health assessment (96160) and office visit, established patient (99213).
Where did Dr. J Duc Ngoc Nguyen go to medical school?
Dr. Nguyen graduated from University of Minnesota Medical School in 1995.
Show 3 more questionsShow fewer questions
What drugs does Dr. J Duc Ngoc Nguyen prescribe most?
In 2024 Medicare Part D data, Dr. Nguyen's most prescribed drugs by claims were Atorvastatin Calcium, Ibuprofen and Metformin HCl.
Has Dr. J Duc Ngoc Nguyen received payments from drug or device companies?
CMS Open Payments shows $583 in general payments to Dr. Nguyen from 13 companies from 2016 to 2023. The largest total came from ITI, Inc.
How long has Dr. J Duc Ngoc Nguyen been practicing?
Dr. Nguyen graduated from medical school in 1995, 31 years ago.
Selling to internal medicine practices?
See internists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card