Richard Thien Nguyen, M.D.
Geriatric Medicine (Internal Medicine) Physician · San Diego, CA
Richard Thien Nguyen, M.D. is a geriatric medicine (internal medicine) physician with a practice address in San Diego, California, and NPI 1275724361, issued on Aug 5, 2007. Check the license (California A97934, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Richard Thien Nguyen
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- A97934 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2810 Camino Del Rio S, San Diego, CA 92108
- Phone
- (619) 299-1419
- Enumerated
- Aug 5, 2007
- Record last updated
- Apr 6, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (858) 461-6008
- Medicare enrollment
- Enrolled (PECOS I20080116000856); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 2810 Camino Del Rio S
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gregory Antkowiak, MDGeriatric Medicine (Internal Medicine) Physician1154307775
- Steven BohnaCounselor1336093798
- Jason Keri, MDGeriatric Psychiatry Physician1811915812
- Aboo Nasar, M.D.Geriatric Medicine (Internal Medicine) Physician1871533380
Verify Richard Thien Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A97934Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
3,964 Medicare Part D claims for 163 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. 91 claims were for opioids.
Most prescribed
- Eliquis279 claims
- Atorvastatin Calcium230 claims
- Gabapentin171 claims
- Levothyroxine Sodium155 claims
- Amlodipine Besylate133 claims
- Lisinopril97 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): 13 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).
Bills Medicare through 3 group practices
- Del Sur HealthcareEl Cajon, CA
- Rawi Medical, PCSan Diego, CA
- Senior Medical Associates IncSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Richard Thien Nguyen among 532 geriatric medicine (internal medicine) physician records in California
Richard Thien Nguyen, M.D. is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 54% of them.
- NPI issued2007 · 54% of these records are older, 34% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2005 · median 1999 among the 271 with a school on file
- Record last updated2017 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
All 532 in California → Every provider in San Diego → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Pouya Afshar, M.D.San Diego, CA 921081184958977
- Gregory Antkowiak, MDSan Diego, CA 921081154307775
- Cary Bayne, MDSan Diego, CA 921081366463218
- Eric Emont, M.D.San Diego, CA 921081376626754
- Winston Mina, MDSan Diego, CA 921081174582001
- Aboo Nasar, M.D.San Diego, CA 921081871533380
- Danilo Tan, M.D.San Diego, CA 921081073648200
- Derek Hauser, D.O.San Diego, CA 921101093961757
Common questions
What is Richard Thien Nguyen, M.D.'s NPI number?
Richard Thien Nguyen, M.D.'s National Provider Identifier (NPI) is 1275724361, issued on Aug 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Richard Thien Nguyen, M.D. located?
The NPPES record lists a practice address at 2810 Camino Del Rio S, San Diego, CA, 92108. Phone: (619) 299-1419. Providers update this record themselves, so call before visiting.
How can I verify Richard Thien Nguyen, M.D.'s license?
NPPES lists California license number A97934, 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 Thien Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Richard Thien Nguyen, M.D. had 3,964 Medicare Part D claims for 163 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
What is Richard Thien Nguyen, M.D.'s MIPS final score?
The 2023 MIPS final score is 13 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.