NPPES file of Aug 9, 2026

Olivia Nguyen

Addiction Medicine (Family Medicine) Physician · Ventura, CA

Olivia Nguyen is an addiction medicine (family medicine) physician with a practice address in Ventura, California, and NPI 1902478779, issued on Jul 12, 2021. Check the license (California A196357, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1902478779
Name
Olivia Nguyen
Primary taxonomy
Addiction Medicine (Family Medicine) Physician 207QA0401X
License number
A196357 CA
Self-reported in NPPES; status is on the state search
Practice location
300 Hillmont Ave, Ventura, CA 93003
Phone
(805) 652-6000
Enumerated
Jul 12, 2021
Record last updated
Jun 23, 2025
Medicare enrollment
Enrolled (PECOS I20250204001484); accepts Medicare assignment
Medical or professional school
University Of Texas Southwestern Medical School At Dallas, 2021
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest addiction medicine (family medicine) physician records → All 124 in California → Look up another NPI →

Also registered at 300 Hillmont Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Thomas Adelman, CRTTCertified Respiratory Therapist1114732666
  2. Henrique Aihara, TECHElectroneurodiagnostic Specialist/Technologist1861108235
  3. Anne Akhimien, MDFamily Medicine Physician1205408515
  4. Trease Allen, PSYCH TECHLicensed Psychiatric Technician1174648620
  5. Mary Allport, LCSWClinical Social Worker1083739320
  6. Edgar Alviz, RNPsychiatric/Mental Health Registered Nurse1386763175

Verify Olivia Nguyen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A196357    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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61% fewer Medicare Part D claims than the average addiction medicine (family medicine) physician in 2024

258 Medicare Part D claims for 49 beneficiaries, against an average of 664 among the 581 providers of this specialty who prescribed in Part D.

  1. Olivia Nguyen258
  2. Specialty average664

Most prescribed

  1. Atorvastatin Calcium25 claims
  2. Ozempic14 claims
  3. Losartan Potassium12 claims
  4. Metformin Hcl Er11 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.

Industry payments in 2024: $108.51

5 payments; by number, the most common kind was food and beverage; the largest payer was Indivior Inc. The 305 providers of this specialty with any payment received $1,151.00 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Olivia Nguyen$108.51
  2. Specialty average$1,151.00

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. County OF VenturaVentura, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Olivia Nguyen among 124 addiction medicine (family medicine) physician records in California

Olivia Nguyen is one of 124 addiction medicine (family medicine) physician records with a practice address in California. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 90% of them.

  • NPI issued2021 · 90% of these records are older, 7% newer
  • In a Medicare fileYes · 78% of these records are
  • In the CMS Doctors and Clinicians fileYes · 52% of these records are
  • Graduated2021 · median 2015 among the 64 with a school on file
  • Record last updated2025 · 33% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0401X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Addiction Medicine (Family Medicine) Physician providers in California

There are 124 addiction medicine (family medicine) physician records in California.

All 124 in California → Every provider in Ventura → Addiction Medicine (Family Medicine) Physician nationwide →

The 8 addiction medicine (family medicine) physician records with the nearest ZIP codes

  1. Lorenz Choi, DOVentura, CA 930031619592623
  2. Christopher Fernandez, DOVentura, CA 930031902427404
  3. Alexander Howard, DOVentura, CA 930031528707593
  4. Tipu Khan, M.D.Ventura, CA 930031801059555
  5. Morgan Kirkpatrick, MDVentura, CA 930031457915795
  6. Matthew Lamon, DOVentura, CA 930031356835243
  7. Oluwatumininu Oludemi, DOVentura, CA 930031013656883
  8. Nataliya Panivska, DOVentura, CA 930031821619529

Common questions

What is Olivia Nguyen's NPI number?

Olivia Nguyen's National Provider Identifier (NPI) is 1902478779, issued on Jul 12, 2021. An NPI identifies a provider in billing; it is not a license.

Where is Olivia Nguyen located?

The NPPES record lists a practice address at 300 Hillmont Ave, Ventura, CA, 93003. Phone: (805) 652-6000. Providers update this record themselves, so call before visiting.

How can I verify Olivia Nguyen's license?

NPPES lists California license number A196357, 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 Olivia Nguyen prescribe under Medicare Part D?

In 2024, Olivia Nguyen had 258 Medicare Part D claims for 49 beneficiaries; the average among addiction medicine (family medicine) physician prescribers was 664. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.