James Saeyung Ahn, M.D.
Anesthesiology Physician · Corona, CA
James Saeyung Ahn, M.D. is an anesthesiology physician with a practice address in Corona, California, and NPI 1588641963, issued on Dec 28, 2005. Check the license (California G84344, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Saeyung Ahn
- Credential
- M.D.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- G84344 CA
Self-reported in NPPES; status is on the state search - Practice location
- 800 S Main St, Corona, CA 92882
- Phone
- (951) 737-4343
- Enumerated
- Dec 28, 2005
- Record last updated
- May 8, 2024
- Medicaid ID
- 00G843440 CA
- Medicare enrollment
- Enrolled (PECOS I20050714000559); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 7,571 in California → Look up another NPI →
Also registered at 800 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Charles Addo-Yobo, DOEmergency Medicine Physician1821625955
- Julie Ahn, PA-CPhysician Assistant1346802543
- Thomas Assali, DOInternal Medicine Physician1598225062
- Cynthia Bailey, P.A.-CPhysician Assistant1316053036
- David Bear, M.D.Emergency Medicine Physician1114033883
- Denise Bedolla, FNP-BCNurse Practitioner1720700503
Verify James Saeyung Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G84344Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Corona Anesthesia Group IncCorona, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Saeyung Ahn among 7,571 anesthesiology physician records in California
James Saeyung Ahn, M.D. is one of 7,571 anesthesiology physician records with a practice address in California. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1990 · median 2006 among the 4,868 with a school on file
- Record last updated2024 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Anesthesiology Physician providers in California
There are 7,571 anesthesiology physician records in California.
All 7,571 in California → Every provider in Corona → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Charles Dai, M.D.Corona, CA 928821730135401
- Mahesh Desilva, M.D.Corona, CA 928821114162682
- Mina Kazemian, DOCorona, CA 928821306330063
- Wendy Martin, MDCorona, CA 928821083686695
- Paul Osunwa, MDCorona, CA 928821255911673
- Ramin Rahimian, M.D.Corona, CA 928821215171467
- Jeffrey Rieker, M.D.Corona, CA 928821043266802
- Mital Shah, DOCorona, CA 928821538663042
Common questions
What is James Saeyung Ahn, M.D.'s NPI number?
James Saeyung Ahn, M.D.'s National Provider Identifier (NPI) is 1588641963, issued on Dec 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James Saeyung Ahn, M.D. located?
The NPPES record lists a practice address at 800 S Main St, Corona, CA, 92882. Phone: (951) 737-4343. Providers update this record themselves, so call before visiting.
How can I verify James Saeyung Ahn, M.D.'s license?
NPPES lists California license number G84344, 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.
What is James Saeyung Ahn, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.