Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mark Joseph Slader, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1134878440

Mark Joseph Slader, MD is an Emergency Medicine in Orange, California. Graduated from University of California, Irvine, California College of Medicine in 2022, 4 years ago. Practices with Regents of the University Of, a 125-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
4
Trained at
University of California, Irvine, California College of Medicine
Licensed in
CA
In the registry since
2022
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

101 The City Dr S
Orange, CA 92868-3201
Phone: (714) 456-7890
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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 A188976 (CA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1134878440
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 22, 2022
Last updated in NPPESJune 4, 2025
Certification dateJune 4, 2025
Mailing address101 The City Dr S, Orange, CA 92868-3201

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, IRVINE, CALIFORNIA COLLEGE OF MEDICINE
Graduated 2022 (4 years in practice)
Group practice Regents Of The University Of — 125 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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