Thomas K. Ryu, DO
Emergency Medical Services (Emergency Medicine) Physician · Irvine, CA
Thomas K. Ryu, DO is an emergency medical services (emergency medicine) physician with a practice address in Irvine, California, and NPI 1164477410, issued on May 24, 2006. Check the license (California 20A5251, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas K. Ryu
- Credential
- DO
- Primary taxonomy
- Emergency Medical Services (Emergency Medicine) Physician 207PE0004X
- License number
- 20A5251 CA
Self-reported in NPPES; status is on the state search - Practice location
- 16200 Sand Canyon Ave, Irvine, CA 92618
- Phone
- (949) 753-2000
- Enumerated
- May 24, 2006
- Record last updated
- Feb 26, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 00AX52510 CA
- Entity
- Type 1 · individual
8 nearest emergency medical services (emergency medicine) physician records → All 233 in California → Look up another NPI →
Also registered at 16200 Sand Canyon Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christine AyalaNurse Practitioner1831879154
- Nicholas Bove, MDEmergency Medicine Physician1255837837
- David Calica, M.D.Anesthesiology Physician1780787606
- Danielle CarlsonRegistered Nurse1710850409
- John Chien, M.D.Hospitalist Physician1790043651
- Michael Cho, M.D.Hospitalist Physician1184915001
Verify Thomas K. Ryu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A5251Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average emergency medical services (emergency medicine) physician in 2024
20 Medicare Part D claims for 12 beneficiaries, against an average of 292 among the 1,653 providers of this specialty who prescribed in Part D.
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.
Thomas K. Ryu among 233 emergency medical services (emergency medicine) physician records in California
Thomas K. Ryu, DO is one of 233 emergency medical services (emergency medicine) physician records with a practice address in California. 69% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 50% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileNo · 42% of these records are
- Record last updated2008 · 68% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0004X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medical Services (Emergency Medicine) Physician providers in California
There are 233 emergency medical services (emergency medicine) physician records in California.
All 233 in California → Every provider in Irvine → Emergency Medical Services (Emergency Medicine) Physician nationwide →
The 8 emergency medical services (emergency medicine) physician records with the nearest ZIP codes
- Caroline Han, MDIrvine, CA 926181114952850
- Albert Jin, MDIrvine, CA 926181790738292
- Steven Lin, MDIrvine, CA 926181821044082
- Ann Ullrich, MDIrvine, CA 926181891741609
- Nathan Gilmore, MDDana Point, CA 926241275725897
- Kenneth Miller, MD, PHDIrvine, CA 926021669592614
- Brandyn Bobb, MDTemecula, CA 925921427635556
- Michelle Ly, D.O.Huntington Beach, CA 926471811161870
Common questions
What is Thomas K. Ryu, DO's NPI number?
Thomas K. Ryu, DO's National Provider Identifier (NPI) is 1164477410, issued on May 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas K. Ryu, DO located?
The NPPES record lists a practice address at 16200 Sand Canyon Ave, Irvine, CA, 92618. Phone: (949) 753-2000. Providers update this record themselves, so call before visiting.
How can I verify Thomas K. Ryu, DO's license?
NPPES lists California license number 20A5251, 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 Thomas K. Ryu, DO prescribe under Medicare Part D?
In 2024, Thomas K. Ryu, DO had 20 Medicare Part D claims for 12 beneficiaries; the average among emergency medical services (emergency medicine) physician prescribers was 292. 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.