Richard X. Nguyen, M.D.
Internal Medicine Physician · Oxnard, CA
Richard X. Nguyen, M.D. is an internal medicine physician with a practice address in Oxnard, California, and NPI 1699960708, issued on Sep 11, 2007. Check the license (California A56329, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Richard X. Nguyen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A56329 CA
Self-reported in NPPES; status is on the state search - Practice location
- 719 N A St, Oxnard, CA 93030
- Phone
- (805) 485-9123
- Enumerated
- Sep 11, 2007
- Record last updated
- Sep 12, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00A563290 CA
- Medicare enrollment
- Enrolled (PECOS I20050224000142); accepts Medicare assignment
- Medical or professional school
- R Franklin University Of Med & Sci/Chicago Medical School, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Verify Richard X. Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A56329Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,814 Medicare Part D claims for 305 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 307 claims were for opioids.
Most prescribed
- Atorvastatin Calcium329 claims
- Omeprazole223 claims
- Levothyroxine Sodium182 claims
- Metformin Hcl180 claims
- Gabapentin176 claims
- Lorazepam159 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.
The MIPS final score for 2023 (Medicare payment program): 88.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
44 internal medicine physician records list a practice address in Oxnard
They are 44 of the 3,211 NPPES records with a practice address in Oxnard, and 17,696 internal medicine physician records in California.
All 44 in Oxnard → All 17,696 in California → Every provider in Oxnard →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Richard X. Nguyen, M.D.'s NPI number?
Richard X. Nguyen, M.D.'s National Provider Identifier (NPI) is 1699960708, issued on Sep 11, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Richard X. Nguyen, M.D. located?
The NPPES record lists a practice address at 719 N A St, Oxnard, CA, 93030. Phone: (805) 485-9123. Providers update this record themselves, so call before visiting.
How can I verify Richard X. Nguyen, M.D.'s license?
NPPES lists California license number A56329, 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 Richard X. Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Richard X. Nguyen, M.D. had 6,814 Medicare Part D claims for 305 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Richard X. Nguyen, M.D.'s MIPS final score?
The 2023 MIPS final score is 88.7 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.