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Dr. Nancy Hao Nguyen, MD
NPI1982963005PAC ID6507146115
- Part D claims, 2024
- 421
- Publications
- 1
- Hospital affiliations
- 2
- Industry payments
- $15
- Medical group
- 1
- 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
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Dr. Nancy Hao Nguyen is an internist in Fontana, California
Dr. Nguyen practices at Kaiser Permanente - Fontana Medical Center in Fontana, California.
Dr. Nguyen's NPI, 1982963005, was assigned on May 9, 2012. Dr. Nguyen graduated from Keck School of Medicine of USC in 2012. Dr. Nguyen's California license number on file is A141336.
NPI and contact details
- NPI
- 1982963005NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507146115
- NPI enumeration date
- May 9, 2012
- 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
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nancy Hao 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. Nancy Hao Nguyen is affiliated with 3 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. Dmand AI also links Dr. Nguyen to 1 more hospital, named with a free account.
Kaiser Permanente - Fontana Medical CenterPrimary
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. Nancy Hao 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 |
|---|---|
| Kaiser Permanente - Fontana Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nancy Hao 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. Dmand AI has Dr. Nguyen's licenses on file in 2 states: California and Ohio.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Ohio license
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. Nancy Hao Nguyen's patients have a median age of 71
Across all payers, Dmand AI patient panel data puts Dr. Nguyen's median patient age at 71, with 50% women.
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 71
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Nancy Hao Nguyen wrote 421 Medicare Part D claims in 2024
In 2024, Dr. Nguyen wrote 421 Medicare Part D claims for 149 patients. 88% of them were for generic drugs. CMS names the drug for 193 of them, across 12 drugs with 11 or more claims each, at $3,339 in total drug cost.
Part D claims, 2024421
Drugs named by CMS12
Total drug cost$3,339
Part D patients149
Dr. Nguyen's Part D claims by kind of drug, 2024
- Generic369 claims88%
- Brand-name and other52 claims12%
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
- Opioids4%16 of 421 claims
- Antibiotics16%66 of 421 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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. Nancy Hao 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. Nancy Hao Nguyen has 1 publication on record
Dmand AI links 1 paper to Dr. Nguyen. Dr. Nguyen's most frequent co-authors are Maya Najib Serhal, MD and Aditya Sharma, MD.
Papers1
Dr. Nguyen's most frequent co-authors
Recent publications by Dr. Nguyen
See who Dr. Nguyen researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Nguyen works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nancy Hao Nguyen received $15 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Nguyen from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $15.
Companies that paid Dr. Nguyen the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Nancy Hao Nguyen graduated from Keck School of Medicine of USC
Dr. Nguyen graduated from Keck School of Medicine of USC in 2012. Dr. Nguyen is a member of ACC.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Nancy Hao Nguyen accepts plans from 2 insurance carriers
Dr. Nguyen is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Nguyen accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Nancy Hao 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 patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Nancy Hao 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. Nancy Hao Nguyen's NPI number?
Dr. Nancy Hao Nguyen's NPI number is 1982963005. It was assigned on May 9, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Nancy Hao Nguyen?
Dr. Nancy Hao Nguyen is an internist in Fontana, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Nancy Hao 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. Dmand AI also links Dr. Nguyen to 1 hospital.
What is Dr. Nancy Hao Nguyen's office phone number?
The practice phone on file for Dr. Nguyen is (909) 427-5000.
What is Dr. Nancy Hao Nguyen's medical license number?
Dr. Nguyen's California license number on file is A141336, one of the licenses on file in 2 states.
Which states has Dr. Nancy Hao Nguyen been licensed in?
Dmand AI has state licenses on file for Dr. Nguyen in California (2016 to 2025) and Ohio (2012 to 2016).
Which hospitals is Dr. Nancy Hao Nguyen affiliated with?
Dr. Nguyen is affiliated with Fontana Medical Center. Dmand AI links Dr. Nguyen to 1 more hospital.
What medical group is Dr. Nancy Hao Nguyen part of?
Dr. Nguyen is linked to Southern California Permanente Medical Group.
Does Dr. Nancy Hao Nguyen accept Medicare?
Yes. CMS lists Dr. Nguyen as accepting Medicare assignment.
Is Dr. Nancy Hao Nguyen board certified?
Yes. Dr. Nguyen is board certified in internal medicine by the American Board of Internal Medicine.
Show 7 more questionsShow fewer questions
Where did Dr. Nancy Hao Nguyen go to medical school?
Dr. Nguyen graduated from Keck School of Medicine of USC in 2012.
What drugs does Dr. Nancy Hao Nguyen prescribe most?
In 2024 Medicare Part D data, Dr. Nguyen's most prescribed drugs by claims were Furosemide, Cefpodoxime Proxetil and Potassium Chloride.
Has Dr. Nancy Hao Nguyen received payments from drug or device companies?
CMS Open Payments shows $15 in general payments to Dr. Nguyen from 1 company from 2025 to 2025. The largest total came from Exact Sciences Corporation.
How long has Dr. Nancy Hao Nguyen been practicing?
Dr. Nguyen graduated from medical school in 2012, 14 years ago.
Does Dr. Nancy Hao Nguyen do research?
Dmand AI links 1 publication to Dr. Nguyen.
Who does Dr. Nancy Hao Nguyen publish with?
Dr. Nguyen's most frequent co-authors are Maya Najib Serhal, MD (1 shared paper) and Aditya Sharma, MD (1 shared paper).
What insurance does Dr. Nancy Hao Nguyen accept?
Dr. Nguyen is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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