James H. Ahn, MD
Emergency Medicine Physician · Redwood City, CA
James H. Ahn, MD is an emergency medicine physician with a practice address in Redwood City, California, and NPI 1528146180, issued on Nov 1, 2006. Check the license (California A62745, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James H. Ahn
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A62745 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1150 Veterans Blvd, Redwood City, CA 94063
- Phone
- (650) 299-2000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A627450 CA
- Medicare enrollment
- Enrolled (PECOS I20101208000518); accepts Medicare assignment
- Medical or professional school
- Yale University School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1150 Veterans Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James H. Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A62745Check 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
- Permanente Medical Group IncSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James H. Ahn among 7,751 emergency medicine physician records in California
James H. Ahn, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1995 · median 2011 among the 4,560 with a school on file
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Redwood City → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Sunil Bhopale, MDRedwood City, CA 940631760561807
- George Bulloch, MDRedwood City, CA 940631134207723
- Gustavo Diaz, MDRedwood City, CA 940631538122635
- Walter Eades, MDRedwood City, CA 940631467530006
- Micheal Heinrich, M.D.Redwood City, CA 940631427150531
- Adam Landsdorf, MDRedwood City, CA 940631134207798
- Gregg Letsinger, MDRedwood City, CA 940631962580555
- John Rosenberg, MDRedwood City, CA 940631558449199
Common questions
What is James H. Ahn, MD's NPI number?
James H. Ahn, MD's National Provider Identifier (NPI) is 1528146180, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James H. Ahn, MD located?
The NPPES record lists a practice address at 1150 Veterans Blvd, Redwood City, CA, 94063. Phone: (650) 299-2000. Providers update this record themselves, so call before visiting.
How can I verify James H. Ahn, MD's license?
NPPES lists California license number A62745, 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.