Christopher P. Nguyen, MD
Geriatric Medicine (Internal Medicine) Physician · Mission Viejo, CA
Christopher P. Nguyen, MD is a geriatric medicine (internal medicine) physician with a practice address in Mission Viejo, California, and NPI 1588624100, issued on Mar 27, 2006. Check the license (California A74293, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Christopher P. Nguyen
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- A74293 CA
Self-reported in NPPES; status is on the state search - Practice location
- 23512 Madero, Mission Viejo, CA 92691
- Phone
- (949) 583-1600
- Enumerated
- Mar 27, 2006
- Record last updated
- Jan 16, 2026
- Fax
- (949) 454-8067
- Medicare enrollment
- Enrolled (PECOS I20060110000321); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 23512 Madero
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jasbir Kaur, MDFamily Medicine Physician1568624948
- Scott Lee, MDFamily Medicine Physician1417948621
Verify Christopher P. Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A74293Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.8 times the Medicare Part D claims of the average geriatric medicine (internal medicine) physician in 2024
11,890 Medicare Part D claims for 932 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 217 claims were for opioids.
Most prescribed
- Atorvastatin Calcium790 claims
- Rosuvastatin Calcium693 claims
- Levothyroxine Sodium632 claims
- Amlodipine Besylate591 claims
- Losartan Potassium318 claims
- Lisinopril310 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: $1,144.98
47 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 1,004 providers of this specialty with any payment received $1,720.82 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 3 group practices
- Centers For Family Medicine GPSeal Beach, CA
- Healthcare Partners Affiliates Medical GroupSeal Beach, CA
- Memorialcare Medical FoundationMission Viejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Christopher P. Nguyen among 532 geriatric medicine (internal medicine) physician records in California
Christopher P. Nguyen, MD 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 46% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2003 · median 1999 among the 271 with a school on file
- Record last updated2026 · 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 Mission Viejo → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Dat Duong, M.D.Westminster, CA 926831689740912
- Victor Siew, M.D.Fountain Valley, CA 927081164515003
- Richard Wong, M.D.Fountain Valley, CA 927081659416436
- Robert Feldman, M.D.Laguna Hills, CA 926531194805416
- Patricia Gifford, MDLaguna Hills, CA 926531487725552
- Suhail Hawit, MDLaguna Hills, CA 926531538229224
- Sarah Teymoorian, M.D.Laguna Hills, CA 926531518147396
- John Homan, MDHuntington Beach, CA 926461437116142
Common questions
What is Christopher P. Nguyen, MD's NPI number?
Christopher P. Nguyen, MD's National Provider Identifier (NPI) is 1588624100, issued on Mar 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christopher P. Nguyen, MD located?
The NPPES record lists a practice address at 23512 Madero, Mission Viejo, CA, 92691. Phone: (949) 583-1600. Providers update this record themselves, so call before visiting.
How can I verify Christopher P. Nguyen, MD's license?
NPPES lists California license number A74293, 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 Christopher P. Nguyen, MD prescribe under Medicare Part D?
In 2024, Christopher P. Nguyen, MD had 11,890 Medicare Part D claims for 932 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.