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

Mark Geoffery Stein, MD

Individual provider Body Imaging Physician · NPI 1265478564

Mark Geoffery Stein, MD practises Diagnostic Radiology in Santa Ana, California. Qualified in 1978, 48 years ago. Practices with Uc Regents, a 103-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
48
Licensed in
CA
In the registry since
2006
Specialties on file
3
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

1100 N Tustin Ave Bldg A
Santa Ana, CA 92705-3509 Not confirmed with CMS for 11 years — call before visiting
Phone: (714) 835-6055
Fax: (714) 285-9084
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence A38805 (CA)
Body Imaging Physician Taxonomy 2085B0100X · Licence A38805 (CA)
Diagnostic Ultrasound Physician Taxonomy 2085U0001X · Licence A38805 (CA)

Record details

NPI number1265478564
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 22, 2006
Last updated in NPPESJune 16, 2015

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolOTHER
Graduated 1978 (48 years in practice)
Group practice Uc Regents — 103 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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 patients674
Services billed 7,286 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.

  • Uci Health-Orange Hospital · Orange, CA

Colleagues at Uc Regents

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 103 clinicians in the practice; 12 are shown here.

Other providers in Santa Ana