Brett Hadley, D.O.
Emergency Medicine Physician · Aliso Viejo, CA
Brett Hadley, D.O. is an emergency medicine physician with a practice address in Aliso Viejo, California, and NPI 1932499829, issued on Apr 12, 2011. Check the license on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brett Hadley
- Credential
- D.O.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- OT013416 PA
Self-reported in NPPES; status is on the state search - Practice location
- 35 Argonaut, Aliso Viejo, CA 92656
- Phone
- (801) 367-9019
- Enumerated
- Apr 12, 2011
- Record last updated
- Jul 30, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (949) 770-2630
- Medicare enrollment
- Enrolled (PECOS I20140604002647); accepts Medicare assignment
- Medical or professional school
- Western University Of Health Sciences College Of Dental Med, 2010
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Verify Brett Hadley in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of CaliforniaCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% more Medicare Part D claims than the average emergency medicine physician in 2024
280 Medicare Part D claims for 190 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 55 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen42 claims
- Sulfamethoxazole-Trimethoprim29 claims
- Ondansetron Odt26 claims
- Methylprednisolone21 claims
- Cephalexin17 claims
- Dicyclomine Hcl13 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
- EM Alliance California ApcWildomar, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brett Hadley among 7,751 emergency medicine physician records in California
Brett Hadley, 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 2011, is newer than 60% of them.
- NPI issued2011 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2010 · median 2011 among the 4,560 with a school on file
- Record last updated2014 · 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 Aliso Viejo → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Scott Shreeve, MDAliso Viejo, CA 926561891832051
- Guneet SinghAliso Viejo, CA 926561073976916
- Benjamin Kim-Wakamatsu, MDNewport Beach, CA 926581457409476
- Dwight Arakaki, M.DLaguna Hills, CA 926531376653360
- Joshua Bobko, MDLaguna Hills, CA 926531235397621
- Randall Chong, M.DLaguna Hills, CA 926531124056387
- William Fields, M.DLaguna Hills, CA 926531699703801
- Edward Mescher, M.DLaguna Hills, CA 926531942246897
Common questions
What is Brett Hadley, D.O.'s NPI number?
Brett Hadley, D.O.'s National Provider Identifier (NPI) is 1932499829, issued on Apr 12, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Brett Hadley, D.O. located?
The NPPES record lists a practice address at 35 Argonaut, Aliso Viejo, CA, 92656. Phone: (801) 367-9019. Providers update this record themselves, so call before visiting.
How can I verify Brett Hadley, D.O.'s license?
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 Brett Hadley, D.O. prescribe under Medicare Part D?
In 2024, Brett Hadley, D.O. had 280 Medicare Part D claims for 190 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.