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

Gregory Thomas Bismack, MD

Individual provider Hospitalist Physician · NPI 1619293149

Gregory Thomas Bismack, MD is a Hospitalist in Effingham, Illinois. Graduated from Wayne State University School of Medicine in 2010, 16 years ago. Practices with Cep America - Illinois SNF LLP, an 8-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Illinois, Michigan and Missouri.

Years since qualifying
16
Trained at
Wayne State University School of Medicine
Licensed in
IL, MI, MO
In the registry since
2010
Specialties on file
4
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

503 N Maple St
Effingham, IL 62401-2006
Phone: (217) 342-2121
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 2351 Frank Scott Pkwy E, O Fallon, IL 62269-7457 — (636) 288-4149
  • 401 Corporate Park Dr, Clayton, MO 63105-4201 — (636) 228-4149

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 036.155470 (IL)
Hospitalist Physician Taxonomy 208M00000X · Licence 2022010983 (MO)
Hospitalist Physician Taxonomy 208M00000X · Licence 036155470 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 4301097035 (MI)

Record details

NPI number1619293149
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 8, 2010
Last updated in NPPESJune 22, 2026
Certification dateJune 22, 2026

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Medical schoolWAYNE STATE UNIVERSITY SCHOOL OF MEDICINE
Graduated 2010 (16 years in practice)
Group practice Cep America - Illinois Snf Llp — 8 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 patients409
Services billed 1,085 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 $20 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.

Also affiliated with 1 nursing home, which CMS identifies by certification number only.

Colleagues at Cep America - Illinois SNF LLP

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 8 clinicians in the practice; 3 are shown here.