Bret Kilker, M.D.
Emergency Medicine Physician · Riverside, CA
Bret Kilker, M.D. is an emergency medicine physician with a practice address in Riverside, California, and NPI 1447494497, issued on Apr 21, 2009. Check the license (California A124049, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Bret Kilker
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A124049 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10800 Magnolia Ave, Riverside, CA 92505
- Phone
- (951) 353-2000
- Enumerated
- Apr 21, 2009
- Record last updated
- Mar 14, 2024
- Medicare enrollment
- Enrolled (PECOS I20140116001028); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 10800 Magnolia Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kimberly Adams, PA-CMedical Physician Assistant1053522870
- Alfredo Aguiar, PAPhysician Assistant1043368970
- Michael Aguinaldo, M.D.Pediatrics Physician1851531487
- Maria Aguirre, MDPediatrics Physician1295806255
Verify Bret Kilker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A124049Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
12% more Medicare Part D claims than the average emergency medicine physician in 2024
252 Medicare Part D claims for 170 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 44 claims were for opioids.
Most prescribed
- Cephalexin22 claims
- Ondansetron Odt21 claims
- Prednisone15 claims
- Acetaminophen-Codeine14 claims
- Clindamycin Hcl13 claims
- Hydrocodone-Acetaminophen13 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 one group practice
- Southern California Permanente Medical GroupRiverside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Bret Kilker among 7,751 emergency medicine physician records in California
Bret Kilker, M.D. 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
- Graduated2009 · median 2011 among the 4,560 with a school on file
- Record last updated2024 · 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 Riverside → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Oscar Benitez, MDRiverside, CA 925051710035696
- Barbara Blasko, MDRiverside, CA 925051689741597
- Richard Clinton, M.D.Riverside, CA 925051912117813
- Michael Cordeiro, M.D.Riverside, CA 925051902048473
- Stephen Ferrall, MDRiverside, CA 925051487721296
- Franklin Gbenedio, DORiverside, CA 925051285793943
- Bruce Kim, MDRiverside, CA 925051699834259
- Bella KochuveliRiverside, CA 925051346405842
Common questions
What is Bret Kilker, M.D.'s NPI number?
Bret Kilker, M.D.'s National Provider Identifier (NPI) is 1447494497, issued on Apr 21, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Bret Kilker, M.D. located?
The NPPES record lists a practice address at 10800 Magnolia Ave, Riverside, CA, 92505. Phone: (951) 353-2000. Providers update this record themselves, so call before visiting.
How can I verify Bret Kilker, M.D.'s license?
NPPES lists California license number A124049, 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 Bret Kilker, M.D. prescribe under Medicare Part D?
In 2024, Bret Kilker, M.D. had 252 Medicare Part D claims for 170 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.