Katherine Nguyen
- Part D claims, 2024
- 468
- Industry payments
- $122
- Affiliated sites
- 1
- Medical groups
- 2
- State license
- 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 Katherine 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.
Katherine Nguyen is an internist in Fontana, California
Katherine Nguyen practices at Kaiser Permanente - Fontana Medical Center in Fontana, California.
Katherine Nguyen's NPI, 1871235556, was assigned on April 12, 2022. Katherine Nguyen holds California license 20A21616.
- NPI
- 1871235556NPI Registry (opens in a new tab)
- NPI enumeration date
- April 12, 2022
- NPI status
- Active
- Practice phone
- (909) 427-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Katherine Nguyen practices at Kaiser Permanente - Fontana Medical Center in Fontana, California
Katherine 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
Katherine Nguyen is affiliated with 2 sites of care and 2 medical groups
Katherine Nguyen's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Katherine Nguyen to 1 more group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Katherine Nguyen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Katherine 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 site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Katherine Nguyen is one of 16,751 internists in California
Internal medicine is Katherine Nguyen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Katherine Nguyen is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Katherine 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
Katherine Nguyen's patients have a median age of 51
Across all payers, Dmand AI patient panel data puts Katherine Nguyen's median patient age at 51, with 54% women.
Katherine 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 51
Patient panel by sex, all payers
- Women54%
- Men46%
Source: Dmand AI Patient Panel Data
Katherine Nguyen wrote 468 Medicare Part D claims in 2024
In 2024, Katherine Nguyen wrote 468 Medicare Part D claims for 93 patients. 88% of them were for generic drugs. CMS names the drug for 177 of them, across 8 drugs with 11 or more claims each, at $2,251 in total drug cost.
Katherine Nguyen's Part D claims by kind of drug, 2024
- Generic411 claims88%
- Brand-name45 claims10%
- Other12 claims3%
Katherine 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 Katherine Nguyen's Part D claims, 2024
- Antibiotics3%12 of 468 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
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Katherine Nguyen received $122 in industry payments in 2025
CMS Open Payments shows 1 general payment to Katherine Nguyen from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $122.
Companies that paid Katherine 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
Sources for Katherine 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 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Katherine 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 Katherine Nguyen's NPI number?
Katherine Nguyen's NPI number is 1871235556. It was assigned on April 12, 2022, and it is active in the NPI Registry.
What does Katherine Nguyen specialize in?
Katherine Nguyen is an internist in Fontana, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Katherine Nguyen practice?
Katherine Nguyen practices at 9965 Sierra Ave, Fontana, CA 92335. Katherine Nguyen's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California. Dmand AI also links Katherine Nguyen to 1 group practice or clinic and 1 medical group.
What is Katherine Nguyen's office phone number?
The practice phone on file for Katherine Nguyen is (909) 427-5000.
What is Katherine Nguyen's medical license number?
Katherine Nguyen holds California license 20A21616.
What medical group is Katherine Nguyen part of?
Katherine Nguyen is linked to Southern California Permanente Medical Group. Dmand AI links Katherine Nguyen to 1 more medical group.
What drugs does Katherine Nguyen prescribe most?
In 2024 Medicare Part D data, Katherine Nguyen's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Amlodipine Besylate.
Has Katherine Nguyen received payments from drug or device companies?
CMS Open Payments shows $122 in general payments to Katherine Nguyen from 1 company from 2025 to 2025. The largest total came from Amgen Inc.
How long has Katherine Nguyen been practicing?
Katherine Nguyen's NPI was assigned in 2022.
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