Ryan Itoh, MD
Emergency Medicine Physician · Temecula, CA
Ryan Itoh, MD is an emergency medicine physician with a practice address in Temecula, California, and NPI 1962089573, issued on Mar 28, 2021. Check the license (California A187158, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ryan Itoh
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- A187158 CA
V4124 TX
Self-reported in NPPES; status is on the state search - Practice location
- 31700 Temecula Parkway, Temecula, CA 92592
- Phone
- (951) 331-2535
- Enumerated
- Mar 28, 2021
- Record last updated
- Mar 6, 2026
- Medicare enrollment
- Enrolled (PECOS I20251027000741); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 31700 Temecula Parkway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Shane Daniel, MDStudent in an Organized Health Care Education/Training Program1013767003
- Daniel DaoudStudent in an Organized Health Care Education/Training Program1740034347
- Danielle Dillard, MD PHDStudent in an Organized Health Care Education/Training Program1962344838
- Benjamin Gaylord, MDStudent in an Organized Health Care Education/Training Program1609621770
- Tiffany GoncalvesStudent in an Organized Health Care Education/Training Program1821739905
Verify Ryan Itoh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A187158Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average emergency medicine physician in 2024
202 Medicare Part D claims for 136 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Ondansetron Odt21 claims
- Ibuprofen18 claims
- Cephalexin15 claims
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.
Bills Medicare through 2 group practices
- Dallam-Hartley Counties Hospital DistrictDalhart, TX
- EM Alliance Texas PLLCAmarillo, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ryan Itoh among 7,751 emergency medicine physician records in California
Ryan Itoh, 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 2021, is newer than 92% of them.
- NPI issued2021 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2021 · median 2011 among the 4,560 with a school on file
- Record last updated2026 · 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 Temecula → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Aditya AgrawalTemecula, CA 925921174109797
- Jailyn Avila, M.D.Temecula, CA 925921740549419
- Nagehan Ayakta, MDTemecula, CA 925921063091767
- Taylor Bashara, MDTemecula, CA 925921447990734
- Philine Endres-Shafer, MDTemecula, CA 925921033691456
- Taylor Fernberg, MDTemecula, CA 925921548910334
- Macey JohnsonTemecula, CA 925921902487440
- Caleb LouTemecula, CA 925921144703406
Common questions
What is Ryan Itoh, MD's NPI number?
Ryan Itoh, MD's National Provider Identifier (NPI) is 1962089573, issued on Mar 28, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Ryan Itoh, MD located?
The NPPES record lists a practice address at 31700 Temecula Parkway, Temecula, CA, 92592. Phone: (951) 331-2535. Providers update this record themselves, so call before visiting.
How can I verify Ryan Itoh, MD's license?
NPPES lists California license number A187158, 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 Ryan Itoh, MD prescribe under Medicare Part D?
In 2024, Ryan Itoh, MD had 202 Medicare Part D claims for 136 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.