Nathan Khoa Nguyen, M.D.
Internal Medicine Physician · Walnut Creek, CA
Nathan Khoa Nguyen, M.D. is an internal medicine physician with a practice address in Walnut Creek, California, and NPI 1861636615, issued on Apr 23, 2009. Check the license (California A107250, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nathan Khoa Nguyen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A107250 CA
154500 OR
Self-reported in NPPES; status is on the state search - Practice location
- 1425 S Main St, Walnut Creek, CA 94596
- Phone
- (925) 295-4050
- Enumerated
- Apr 23, 2009
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100715000893); accepts Medicare assignment
- Medical or professional school
- State University Of Ny Upstate Medical University, 2007
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1425 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Derek Ailes, M.D.Emergency Medical Services (Emergency Medicine) Physician1992001804
Verify Nathan Khoa Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A107250Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Southern California Permanente Medical GroupBaldwin Park, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan Khoa Nguyen among 17,696 internal medicine physician records in California
Nathan Khoa 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 2009, is newer than 60% of them.
- NPI issued2009 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2007 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
183 internal medicine physician records list a practice address in Walnut Creek
They are 183 of the 6,170 NPPES records with a practice address in Walnut Creek, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Walnut Creek → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Anthony Arroyo, MDWalnut Creek, CA 945961376621458
- Sheila Bhatia, MDWalnut Creek, CA 945961225135379
- Amrita Dhaliwal, MDWalnut Creek, CA 945961164500740
- Nellia Karakozova, MDWalnut Creek, CA 945961659459154
- Joseph Long, MDWalnut Creek, CA 945961225116379
- Roxanne McDaniel, MDWalnut Creek, CA 945961457439937
- Huu Nguyen, D.O.Walnut Creek, CA 945961811966492
- Jeff Ortiz, MDWalnut Creek, CA 945961891873964
Common questions
What is Nathan Khoa Nguyen, M.D.'s NPI number?
Nathan Khoa Nguyen, M.D.'s National Provider Identifier (NPI) is 1861636615, issued on Apr 23, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Khoa Nguyen, M.D. located?
The NPPES record lists a practice address at 1425 S Main St, Walnut Creek, CA, 94596. Phone: (925) 295-4050. Providers update this record themselves, so call before visiting.
How can I verify Nathan Khoa Nguyen, M.D.'s license?
NPPES lists California license number A107250, 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.
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.