Dr. Jacquelyn Yen Nguyen, MD
- Medicare services, 2024
- 73
- Medicare patients, 2024
- 38
- Part D claims, 2024
- 1,062
- Hospital affiliations
- 1
- Industry payments
- $264
- Practice address
- 9965 Sierra Ave, Fontana, CA 92335
- Practice phone
- Call (909) 427-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kaiser Permanente - Fontana Medical Center
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. Jacquelyn Yen Nguyen is an internist in Fontana, California
Dr. Nguyen practices at Kaiser Permanente - Fontana Medical Center in Fontana, California.
Dr. Nguyen's NPI, 1982855417, was assigned on October 2, 2008. Dr. Nguyen graduated from UC San Diego School of Medicine in 2006. Dr. Nguyen holds California license A102714.
- NPI
- 1982855417NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8628109634
- NPI enumeration date
- October 2, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 427-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jacquelyn Yen Nguyen practices at Kaiser Permanente - Fontana Medical Center in Fontana, California
Dr. Nguyen's primary practice is Kaiser Permanente - Fontana Medical Center, at 9965 Sierra Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-5000.
- Kaiser Permanente - Fontana Medical Center9965 Sierra Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Jacquelyn Yen Nguyen is affiliated with 2 sites of care and 1 medical group
Dr. Nguyen's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California. Dr. Nguyen is also affiliated with Fontana Medical Center. The medical group on file is Southern California Permanente Medical Group.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jacquelyn Yen Nguyen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nguyen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente - Fontana Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jacquelyn Yen 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 board certified in internal medicine by the American Board of Internal Medicine. 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. Jacquelyn Yen Nguyen billed Medicare for 73 services in 2024
CMS data shows 73 Medicare services from Dr. Nguyen across 2 procedure codes in 2024, for 38 Medicare patients. Medicare paid $5,151 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Nguyen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 312024: 73135%
Dr. Nguyen compared with the California median for internists, 2024
- Dr. Nguyen
- California median
- Medicare services
- 73vs 36180% below
- Medicare patients
- 38vs 15175% below
- Part D claims
- 871vs 4212.1 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.
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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. Jacquelyn Yen Nguyen treated 38 Medicare patients in 2024, average age 62
CMS counts 38 Medicare patients who saw Dr. Nguyen in 2024. The largest group is under 65, with 22 patients. 75% of them have chronic kidney disease, and 75% have diabetes. 53% are also on Medicaid. Their average risk score is 7.10, 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 62, with 46% 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
- Women2053%
- Men1847%
Chronic conditions among Dr. Nguyen's Medicare patients, 2024
- Chronic kidney disease75%
- Diabetes75%
- High blood pressure75%
- High cholesterol75%
- Heart failure63%
- Ischemic heart disease55%
- Atrial fibrillation37%
- Mood disorders37%
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 62
Patient panel by sex, all payers
- Women46%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jacquelyn Yen Nguyen wrote 1,062 Medicare Part D claims in 2024
In 2024, Dr. Nguyen wrote 1,062 Medicare Part D claims for 284 patients. 93% of them were for generic drugs. CMS names the drug for 871 of them, across 17 drugs with 11 or more claims each, at $52,252 in total drug cost. In 2023, CMS named 950 claims across 20 drugs.
Dr. Nguyen's Part D claims by kind of drug, 2024
- Generic991 claims93%
- Brand-name71 claims7%
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
- Antibiotics2%21 of 1,062 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: 9502024: 8718%
Drugs named by CMS: 17 in 2024, 20 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
How Dr. Jacquelyn Yen Nguyen takes part in Medicare
Dr. Nguyen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Jacquelyn Yen Nguyen received $264 in industry payments from 2016 to 2019
CMS Open Payments shows 6 general payments to Dr. Nguyen from 4 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Relypsa, Inc. paid the most, $147.
General payments to Dr. Nguyen by program year, 2016 to 2019
Companies that paid Dr. Nguyen the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jacquelyn Yen Nguyen has 1 award and honors on record
Dmand AI lists 1 award for Dr. Nguyen, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Nguyen
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Jacquelyn Yen Nguyen graduated from UC San Diego School of Medicine
Dr. Nguyen graduated from UC San Diego School of Medicine in 2006.
- Medical school
- Board certified in internal medicine
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Jacquelyn Yen Nguyen accepts plans from 1 insurance carrier
Dr. Nguyen is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Jacquelyn Yen 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Jacquelyn Yen 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. Jacquelyn Yen Nguyen's NPI number?
Dr. Jacquelyn Yen Nguyen's NPI number is 1982855417. It was assigned on October 2, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Jacquelyn Yen Nguyen?
Dr. Jacquelyn Yen Nguyen is an internist in Fontana, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Jacquelyn Yen Nguyen practice?
Dr. Nguyen practices at 9965 Sierra Ave, Fontana, CA 92335. Dr. Nguyen's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California.
What is Dr. Jacquelyn Yen Nguyen's office phone number?
The practice phone on file for Dr. Nguyen is (909) 427-5000.
What is Dr. Jacquelyn Yen Nguyen's medical license number?
Dr. Nguyen holds California license A102714.
Which hospitals is Dr. Jacquelyn Yen Nguyen affiliated with?
Dr. Nguyen is affiliated with Fontana Medical Center.
What medical group is Dr. Jacquelyn Yen Nguyen part of?
Dr. Nguyen is linked to Southern California Permanente Medical Group.
Does Dr. Jacquelyn Yen Nguyen accept Medicare?
Yes. CMS data shows Dr. Nguyen billed Medicare for 73 services in 2024, and Dr. Nguyen accepts Medicare assignment.
How many Medicare patients does Dr. Jacquelyn Yen Nguyen see?
CMS counts 38 Medicare patients who saw Dr. Nguyen in 2024, with an average age of 62.
Is Dr. Jacquelyn Yen Nguyen board certified?
Yes. Dr. Nguyen is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Jacquelyn Yen Nguyen bill to Medicare?
In 2024, Dr. Nguyen's most billed Medicare services were hospital inpatient care (99232) and hospital inpatient care (99222).
Where did Dr. Jacquelyn Yen Nguyen go to medical school?
Dr. Nguyen graduated from UC San Diego School of Medicine in 2006.
What drugs does Dr. Jacquelyn Yen Nguyen prescribe most?
In 2024 Medicare Part D data, Dr. Nguyen's most prescribed drugs by claims were Furosemide, Losartan Potassium and Lisinopril.
Has Dr. Jacquelyn Yen Nguyen received payments from drug or device companies?
CMS Open Payments shows $264 in general payments to Dr. Nguyen from 4 companies from 2016 to 2019. The largest total came from Relypsa, Inc.
How long has Dr. Jacquelyn Yen Nguyen been practicing?
Dr. Nguyen graduated from medical school in 2006, 20 years ago.
What insurance does Dr. Jacquelyn Yen Nguyen accept?
Dr. Nguyen is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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