Stephen H. Nguyen, MD
Internal Medicine Physician · Sun City, CA
Stephen H. Nguyen, MD is an internal medicine physician with a practice address in Sun City, California, and NPI 1619976644, issued on Jul 20, 2005. Check the license (California A72564, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen H. Nguyen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A72564 CA
Self-reported in NPPES; status is on the state search - Practice location
- 29798 Haun RD Ste 206, Sun City, CA 92586
- Phone
- (951) 672-4900
- Enumerated
- Jul 20, 2005
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (951) 301-0025
- Medicare enrollment
- Enrolled (PECOS I20060227000778); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Stephen H. Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A72564Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.3 times the Medicare Part D claims of the average internal medicine physician in 2024
13,734 Medicare Part D claims for 915 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 419 claims were for opioids.
Most prescribed
- Atorvastatin Calcium823 claims
- Rosuvastatin Calcium778 claims
- Levothyroxine Sodium625 claims
- Amlodipine Besylate411 claims
- Tamsulosin Hcl300 claims
- Olmesartan Medoxomil296 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): 95.8 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).
Industry payments in 2024: $858.25
35 payments; by number, the most common kind was food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
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
- Newport Center Medical GroupNewport Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen H. Nguyen among 17,696 internal medicine physician records in California
Stephen H. Nguyen, MD 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1997 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 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).
13 internal medicine physician records list a practice address in Sun City
They are 13 of the 137 NPPES records with a practice address in Sun City, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sun City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Tomas Araneta, M.D.Menifee, CA 925861952419970
- Duane Darnell, DOSun City, CA 925861831199728
- Linda Evans, MDSun City, CA 925861891896775
- Edivina Gonzales, M.D.Sun City, CA 925861386670479
- Patrick Gonzales, M.D.Sun City, CA 925861194751289
- James Krieg, M.D.Sun City, CA 925861568431120
- Richard Lam, MDSun City, CA 925861003830191
- David Nguyen, MDSun City, CA 925861780683714
Common questions
What is Stephen H. Nguyen, MD's NPI number?
Stephen H. Nguyen, MD's National Provider Identifier (NPI) is 1619976644, issued on Jul 20, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Stephen H. Nguyen, MD located?
The NPPES record lists a practice address at 29798 Haun RD Ste 206, Sun City, CA, 92586. Phone: (951) 672-4900. Providers update this record themselves, so call before visiting.
How can I verify Stephen H. Nguyen, MD's license?
NPPES lists California license number A72564, 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 Stephen H. Nguyen, MD prescribe under Medicare Part D?
In 2024, Stephen H. Nguyen, MD had 13,734 Medicare Part D claims for 915 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Stephen H. Nguyen, MD's MIPS final score?
The 2023 MIPS final score is 95.8 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.