Don S. Oh, M.D.
Internal Medicine Physician · Tustin, CA
Don S. Oh, M.D. is an internal medicine physician with a practice address in Tustin, California, and NPI 1326247669, issued on Jul 17, 2007. Check the license (California A038686, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Don S. Oh
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A038686 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2488 Aquasanta, Tustin, CA 92782
- Phone
- (714) 222-3258
- Enumerated
- Jul 17, 2007
- Record last updated
- Jul 17, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (713) 544-3261
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Don S. Oh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A038686Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Don S. Oh among 17,696 internal medicine physician records in California
Don S. Oh, 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 not. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- 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).
34 internal medicine physician records list a practice address in Tustin
They are 34 of the 2,221 NPPES records with a practice address in Tustin, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,696 in California → Every provider in Tustin → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Lisa Abdishoo, MDTustin, CA 927821881776326
- Robert Bader, MDTustin, CA 927821225111610
- Charlie Huang, D.O.Tustin, CA 927821427591577
- Eric Khau, MDTustin, CA 927821437654134
- Drumil Bhatt, MDTustin, CA 927801679033625
- Grace Chang Broderick, M.D.Tustin, CA 927801548525264
- Patrick Clarke, M.D.Tustin, CA 927801194015891
- Tariq Khan, M.D.Tustin, CA 927801295925253
Common questions
What is Don S. Oh, M.D.'s NPI number?
Don S. Oh, M.D.'s National Provider Identifier (NPI) is 1326247669, issued on Jul 17, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Don S. Oh, M.D. located?
The NPPES record lists a practice address at 2488 Aquasanta, Tustin, CA, 92782. Phone: (714) 222-3258. Providers update this record themselves, so call before visiting.
How can I verify Don S. Oh, M.D.'s license?
NPPES lists California license number A038686, 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. 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.