Gregory Thomas Bismack, M.D.
Individual provider Active NPI Internal Medicine Physician · Effingham, IL
NPI 1619293149 · NPPES record last updated Jun 22, 2026
Key facts
- NPI
- 1619293149
- Entity type
- Individual (NPI type 1)
- Primary specialty
- Internal Medicine Physician 207R00000X
- License
- 036.155470 (IL)
- Practice address
- 503 N Maple St
Effingham, IL 62401-2006 - Phone
- (217) 342-2121
- NPI assigned
- Apr 8, 2010
- Sex
- Male
- Sole proprietor
- No
Organizations & group practices 41
Hospital & facility affiliations 6
Medicare Care Compare profile
- Specialty
- Hospitalist
- Education
- Wayne State University School of Medicine, 2010
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
- Cep America - Illinois SNF LLP
Galen Inpatient Physicians PC
Cep America-Illinois Hospitalists, LLP
Ste Genevieve County Memorial Hospital
Practice addresses (Care Compare)
1021 W E St
Belleville, IL 62220-1055
Phone (618) 233-2095
12303 De Paul Dr
Bridgeton, MO 63044-2512
Phone (314) 344-6000
503 N Maple St
Effingham, IL 62401-2006
Phone (217) 342-2121
800 Genevieve Dr
Ste Genevieve, MO 63670-1434
Phone (573) 883-7772
Hospital & facility affiliations
- SSM St Clare Health Center
- Osf Saint Anthony'S Health Center
- Ste Genevieve County Memorial Hospital
- HSHS St Elizabeth'S Hospital
- St Joseph'S Hospital
- Ste Genevieve County Memorial Hospital
Medicare participation
- Medicare fee-for-service enrollment
- Enrolled (3 enrollments) in MI, IL, MO
- Eligible to order & refer
- Part B services: Yes · DME: Yes · Home health: Yes · Power mobility devices: Yes · Hospice: Yes
Medicare enrollment records
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20140326000988 | MI | Practitioner - Internal Medicine |
2466604921 | Reassigns benefits to 4 organizations |
| I20210512002587 | IL | Practitioner - Hospitalist | 2466604921 | Reassigns benefits to 2 organizations |
| I20220422001066 | MO | Practitioner - Hospitalist |
2466604921 | Reassigns benefits to 4 organizations |
National Provider Directory
- Medicare enrollment (NPD)
- Yes
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 036.155470 | IL | MD | Internal Medicine Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Vituity - Michigan Hospitalists PC | Internal Medicine | Current |
Accepting new patients |
| Cep America-Illinois Hospitalists, LLP | Internal Medicine | Current |
Accepting new patients |
| Cep America-Illinois Hospitalists | Hospitalist | Current |
Accepting new patients |
| Henry Ford Health System | Current | Accepting new patients | |
| Henry Ford Health System | Current |
Accepting new patients | |
| Spectrum Health Primary Care Partners | Internal Medicine | Current | Accepting new patients |
| Spectrum Health Primary Care Partners | Internal Medicine | Current |
Accepting new patients |
| Ste. Genevieve County Memorial Hospital | Current |
Accepting new patients | |
| Henry Ford Health System | Internal Medicine | Current |
Accepting new patients |
| Ste Genevieve County Memorial Hospital | Hospitalist | Current |
Accepting new patients |
| Cep America - Illinois SNF, LLP | Internal Medicine | Current |
Accepting new patients |
| Galen Inpatient Physicians, PC | Internal Medicine | Current |
Accepting new patients |
| Galen Inpatient Physicians PC | Hospitalist | Current |
Accepting new patients |
| Cep America-Illinois Hospitalists, LLP | Internal Medicine | Current | Accepting new patients |
| Galen Inpatient Physicians PC. | Internal Medicine | Current | Accepting new patients |
| Ste Genevieve County Memorial Hospital | Current |
Accepting new patients | |
| Sound Inpatient Physicians - Michigan, PLLC | Internal Medicine | Current |
Accepting new patients |
| Spectrum Health Primary Care Partners | Internal Medicine | Current |
Accepting new patients |
| Analytical Pathology Services LTD | Current | Accepting new patients | |
| Sound Inpatient Physicians-Michigan, PLLC | Internal Medicine | Current |
Accepting new patients |
| Cep America - Illinois SNF LLP | Internal Medicine | Current |
Accepting new patients |
| SSM Health Care St. Louis | Past | Accepting new patients |
Locations
2100 Powell St
Ste 900
Emeryville, CA 94608
Phone (510) 350-2777
2100 Powell St
Ste 400
Emeryville, CA 94608
Phone (510) 350-2638
1601 Cummins Dr
Ste D
Modesto, CA 95358
Phone (510) 851-7423
1021 W E St
Belleville, IL 62220
Phone (618) 233-2095
503 N Maple St
Effingham, IL 62401
Phone (217) 342-2121
1 Saint Elizabeth Blvd
O Fallon, IL 62269
Phone 618234212012438
2351 Frank Scott Pkwy E
Shiloh, IL 62269
Phone (217) 620-3319
4500 Memorial Dr
Swansea, IL 62226
Phone (618) 233-7750
406 E Elm St
Carson City, MI 48811
Phone (517) 584-3131
2799 W Grand Blvd
Detroit, MI 48202
Phone (313) 876-2062
4444 Kalamazoo Ave SE
Ste 200
Kentwood, MI 49508
Phone (616) 391-5600
36475 5 Mile Rd
Livonia, MI 48154
Phone (734) 464-4800
580 W College Ave
Marquette, MI 49855
Phone (906) 225-3131
1221 Pine Grove Ave
Port Huron, MI 48060
Phone (810) 989-3300
800 S Washington Ave
Saginaw, MI 48601
Phone (989) 776-8000
16001 W 9 Mile Rd
Southfield, MI 48075
Phone (248) 424-3000
12303 De Paul Dr
Bridgeton, MO 63044
Phone (314) 344-6360
1015 Bowles Ave
Fenton, MO 63026
Phone (636) 496-2000
800 Ste Genevieve Dr
Ste Genevieve, MO 63670
Phone (573) 883-2571
Interoperability endpoints
- gbismack413491@direct-ehr-ssmhc.com
Specialties & licenses
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Hospitalist Physician | 208M00000X | 2022010983 | MO | |
| Hospitalist Physician | 208M00000X | 036155470 | IL | |
| Internal Medicine Physician | 207R00000X | 4301097035 | MI | |
| Internal Medicine Physician | 207R00000X | 036.155470 | IL | Yes |
Addresses
Primary practice location
503 N Maple St
Effingham, IL 62401-2006
Mailing address
801 Swarthmore LN
University City, MO 63130-3620
Phone (248) 808-2485
Other practice location 1
401 Corporate Park Dr
Clayton, MO 63105-4201
Phone (636) 228-4149
Other practice location 2
2351 Frank Scott Pkwy E
O Fallon, IL 62269-7457
Phone (636) 288-4149
Other providers in Effingham, IL
- Amanda Lea Bierman
- Mary Jo Bierman
- Mary Colleen Bingham
- Biomax Rehabilitation Services, Inc
- Roger E. Bishop
- David J Bitzer
- BK Services
- Kevin Zachary Black
- Sandra Susan Blazek
- Peter Theodorus Bleeker
All providers in Effingham, IL · Internal Medicine Physician in Illinois
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Record last updated by the provider on Jun 22, 2026. Information in NPPES is self-reported and not verified by CMS.
- NUCC Health Care Provider Taxonomy: specialty names.
- Medicare Fee-For-Service Public Provider Enrollment (CMS/PECOS): enrollments, PAC IDs and benefit reassignments.
- Order and Referring (CMS).
- Medicare Care Compare provider data (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.