Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Brett Hadley, DO

Individual provider Emergency Medicine Physician · NPI 1932499829

Brett Hadley, DO practises Emergency Medicine in Aliso Viejo, California. Graduated from Western University of Health Sciences College of Dental Med in 2010, 16 years ago. Practices with Em Alliance California APC, a 70-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
16
Trained at
Western University of Health Sciences College of Dental Med
Licensed in
PA
In the registry since
2011
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

35 Argonaut Ste B-2
Aliso Viejo, CA 92656-4151 Not confirmed with CMS for 12 years — call before visiting
Phone: (801) 367-9019
Fax: (949) 770-2630
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence OT013416 (PA)

Record details

NPI number1932499829
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedApril 12, 2011
Last updated in NPPESJuly 30, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolWESTERN UNIVERSITY OF HEALTH SCIENCES COLLEGE OF DENTAL MED
Graduated 2010 (16 years in practice)
Group practice Em Alliance California Apc — 70 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients440
Services billed 604 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Palmdale Regional Medical Center Hospital · Palmdale, CA
  • Southwest Healthcare Rancho Springs Hospital Hospital · Murrieta, CA

Colleagues at Em Alliance California APC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 70 clinicians in the practice; 12 are shown here.

Other providers in Aliso Viejo