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

Jeffrey Thomas

Individual provider Hospitalist Physician · NPI 1932337136

Jeffrey Thomas practises Internal Medicine in Orange, California. Graduated from Tufts University School of Medicine in 2009, 17 years ago. Practices with J M Geiss DO APC, a 13-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
17
Trained at
Tufts University School of Medicine
Licensed in
CA
In the registry since
2009
Specialties on file
2
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Practice location Address checks out

2592 N Santiago Blvd
Orange, CA 92867-1862
Phone: (855) 434-7763
Fax: (949) 281-5550
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A115831 (CA)
Hospitalist Physician Taxonomy 208M00000X · Licence A115831 (CA)

Record details

NPI number1932337136
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedJune 25, 2009
Last updated in NPPESDecember 11, 2023
Certification dateDecember 11, 2023

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolTUFTS UNIVERSITY SCHOOL OF MEDICINE
Graduated 2009 (17 years in practice)
Group practice J M Geiss Do Apc — 13 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations47 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 patients3,363
Services billed 14,983 a service is one billed item, such as a visit, a test or a procedure
Average patient age84

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $18 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at J M Geiss DO APC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Orange