Ray Zhao, D.O.
Emergency Medicine Physician · San Dimas, CA
Ray Zhao, D.O. is an emergency medicine physician with a practice address in San Dimas, California, and NPI 1558595967, issued on May 13, 2009. Check the license (California 20A10792, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ray Zhao
- Credential
- D.O.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A10792 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1350 W Covina Blvd, San Dimas, CA 91773
- Phone
- (626) 872-3457
- Enumerated
- May 13, 2009
- Record last updated
- Dec 2, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20091030000172); 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 1350 W Covina Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amneh Alnsour, M.DStudent in an Organized Health Care Education/Training Program1427848068
- Deanna Anthoney, MDEmergency Medicine Physician1982642161
- Bassam Aziz, FNP-BCFamily Nurse Practitioner1518664879
- Maria Sagrario Azurin, RNRegistered Nurse1609491372
- Olayiwola Babalola, MDFamily Medicine Physician1508548538
- Udhamgurjot Bajwa, M.D.Student in an Organized Health Care Education/Training Program1154263093
Verify Ray Zhao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A10792Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% more Medicare Part D claims than the average emergency medicine physician in 2024
450 Medicare Part D claims for 269 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin-Clavulanate Potass78 claims
- Albuterol Sulfate Hfa58 claims
- Cephalexin42 claims
- Ciprofloxacin Hcl38 claims
- Azithromycin31 claims
- Cefpodoxime Proxetil20 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
- County OF Los AngelesEl Monte, CA
- Southern California Permanente Medical GroupBaldwin Park, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ray Zhao among 7,751 emergency medicine physician records in California
Ray Zhao, D.O. 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 2009, is newer than 54% of them.
- NPI issued2009 · 54% of these records are older, 42% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2005 · 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).
12 emergency medicine physician records list a practice address in San Dimas
They are 12 of the 942 NPPES records with a practice address in San Dimas, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in San Dimas → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Deanna Anthoney, MDSan Dimas, CA 917731982642161
- Alfred Fernandez, MDSan Dimas, CA 917731538696042
- Brenda Hayakawa, MDSan Dimas, CA 917731679527386
- Bruce Hensel, MDSan Dimas, CA 917731700824083
- Glenn Kane, MDSan Dimas, CA 917731649218835
- Nadine Konia, MDSan Dimas, CA 917731104873413
- Brandon Kuang, MDSan Dimas, CA 917731801393871
- Andrew Nguyen, MDSan Dimas, CA 917731659021269
Common questions
What is Ray Zhao, D.O.'s NPI number?
Ray Zhao, D.O.'s National Provider Identifier (NPI) is 1558595967, issued on May 13, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Ray Zhao, D.O. located?
The NPPES record lists a practice address at 1350 W Covina Blvd, San Dimas, CA, 91773. Phone: (626) 872-3457. Providers update this record themselves, so call before visiting.
How can I verify Ray Zhao, D.O.'s license?
NPPES lists California license number 20A10792, 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 Ray Zhao, D.O. prescribe under Medicare Part D?
In 2024, Ray Zhao, D.O. had 450 Medicare Part D claims for 269 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.