Hai Dong Nguyen, M.D.
Internal Medicine Physician · Santa Ana, CA
Hai Dong Nguyen, M.D. is an internal medicine physician with a practice address in Santa Ana, California, and NPI 1558516963, issued on Nov 26, 2008. Check the license (California A114137, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Hai Dong Nguyen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A114137 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2907 Sawgrass Dr, Santa Ana, CA 92706
- Phone
- (714) 675-3937
- Enumerated
- Nov 26, 2008
- Record last updated
- Dec 19, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (877) 820-4151
- Medicare enrollment
- Enrolled (PECOS I20110718000763); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Hai Dong Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A114137Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
62% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,196 Medicare Part D claims for 451 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium68 claims
- Cephalexin65 claims
- Atorvastatin Calcium56 claims
- Cefdinir53 claims
- Metoprolol Tartrate50 claims
- Prednisone49 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.
Bills Medicare through 2 group practices
- Alertive Healthcare Medical Group ApcRiverside, CA
- Grace Hospitalist Group IncWildomar, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hai Dong Nguyen among 17,696 internal medicine physician records in California
Hai Dong Nguyen, M.D. 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 2008, is newer than 56% of them.
- NPI issued2008 · 56% of these records are older, 40% 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 updated2013 · 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).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Ana → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nabil GemayelSanta Ana, CA 927061619091691
- Hidenori Ikuhara, M.D.Santa Ana, CA 927061598889750
- Julie Low, MDSanta Ana, CA 927061972682698
- Quy Nguyen, M.D.Santa Ana, CA 927061033289699
- Tiffany Prachachalerm, DOSanta Ana, CA 927061104319565
- Christopher Ried, M.D.Santa Ana, CA 927061740359264
- Christopher Zimmerman, MD, MPHSanta Ana, CA 927061891018065
- Frank Badin, M.D.Santa Ana, CA 927051962562850
Common questions
What is Hai Dong Nguyen, M.D.'s NPI number?
Hai Dong Nguyen, M.D.'s National Provider Identifier (NPI) is 1558516963, issued on Nov 26, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Hai Dong Nguyen, M.D. located?
The NPPES record lists a practice address at 2907 Sawgrass Dr, Santa Ana, CA, 92706. Phone: (714) 675-3937. Providers update this record themselves, so call before visiting.
How can I verify Hai Dong Nguyen, M.D.'s license?
NPPES lists California license number A114137, 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 Hai Dong Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Hai Dong Nguyen, M.D. had 1,196 Medicare Part D claims for 451 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.