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

Individual provider Emergency Medicine Physician · NPI 1538501705

Cassondra Nigg Majestic, MD practises Emergency Medicine in Irvine, California. Graduated from Ohio State University College of Medicine in 2013, 13 years ago. Practices with Emergency Physicians of Orange County, a 62-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
13
Trained at
Ohio State University College of Medicine
Licensed in
CA
In the registry since
2013
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

16200 Sand Canyon Ave
Irvine, CA 92618-3714
Phone: (949) 517-3010
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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 136050 (CA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1538501705
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 29, 2013
Last updated in NPPESApril 23, 2026
Certification dateApril 23, 2026

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOHIO STATE UNIVERSITY COLLEGE OF MEDICINE
Graduated 2013 (13 years in practice)
Group practice Emergency Physicians Of Orange County — 62 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 patients455
Services billed 703 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Colleagues at Emergency Physicians of Orange County

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 62 clinicians in the practice; 12 are shown here.

Other providers in Irvine