Katherine Nguyen
Internal Medicine Physician · West Hills, CA
Katherine Nguyen is an internal medicine physician with a practice address in West Hills, California, and NPI 1871235556, issued on Apr 12, 2022. Check the license (California 20A21616, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katherine Nguyen
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A21616 CA
Self-reported in NPPES; status is on the state search - Practice location
- 22110 Roscoe Blvd Ste 100, West Hills, CA 91304
- Phone
- (818) 481-0118
- Enumerated
- Apr 12, 2022
- Record last updated
- Jun 19, 2025
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 22110 Roscoe Blvd Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hoang Nguyen, M.DFamily Medicine Physician1124011952
Verify Katherine Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A21616Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average internal medicine physician in 2024
468 Medicare Part D claims for 93 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.
Most prescribed
- Atorvastatin Calcium44 claims
- Lisinopril29 claims
- Amlodipine Besylate25 claims
- Metformin Hcl24 claims
- Gabapentin16 claims
- Losartan Potassium16 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.
Katherine Nguyen among 17,696 internal medicine physician records in California
Katherine Nguyen 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 2022, is newer than 95% of them.
- NPI issued2022 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2025 · 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).
22 internal medicine physician records list a practice address in West Hills
They are 22 of the 708 NPPES records with a practice address in West Hills, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in West Hills → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nabil Feghali, MDCanoga Park, CA 913041982787057
- Mina Mortezai, D.O.West Hills, CA 913041770547325
- Maryam Mortezaiefard, D.O.West Hills, CA 913041285653196
- Afzal Sahibzada, M.D.Canoga Park, CA 913041710067004
- Michael Akhondi, MDCanoga Park, CA 913031437226347
- Jeremy Grosser, M.D.Canoga Park, CA 913031235123373
- Jay Lin, M.D.Canoga Park, CA 913031275551251
- Rami Shaarawy, M.D.Canoga Park, CA 913031154494755
Common questions
What is Katherine Nguyen's NPI number?
Katherine Nguyen's National Provider Identifier (NPI) is 1871235556, issued on Apr 12, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Nguyen located?
The NPPES record lists a practice address at 22110 Roscoe Blvd Ste 100, West Hills, CA, 91304. Phone: (818) 481-0118. Providers update this record themselves, so call before visiting.
How can I verify Katherine Nguyen's license?
NPPES lists California license number 20A21616, 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 Katherine Nguyen prescribe under Medicare Part D?
In 2024, Katherine Nguyen had 468 Medicare Part D claims for 93 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.