Gregory Thomas Bismack, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

036.155470 Issued in IL

Practice address

503 N Maple St
Effingham, IL 62401-2006

Phone

(217) 342-2121

NPI assigned

Apr 8, 2010

Last updated

Jun 22, 2026By the provider in NPPES

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 4

Addresses

Medicare fee-for-service enrollment

Enrolled in MI, IL, MO3 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 3

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 LLPGroup PAC ID 8022306737, 8 clinicians

Galen Inpatient Physicians PCGroup PAC ID 3678464633, 1,045 clinicians

Cep America-Illinois Hospitalists, LLPGroup PAC ID 3274765904, 193 clinicians

Ste Genevieve County Memorial HospitalGroup PAC ID 3274432802, 74 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• SSM St Clare Health Center Hospital, Fenton, MO, CCN 260081
• Osf Saint Anthony's Health Center Hospital, Alton, IL, CCN 140052
• Ste Genevieve County Memorial Hospital Hospital, Sainte Genevieve, MO, CCN 261330
• HSHS St Elizabeth's Hospital Hospital, O Fallon, IL, CCN 140187
• St Joseph's Hospital Hospital, Highland, IL, CCN 141336
• Ste Genevieve County Memorial Hospital Nursing home, CCN 26Z330

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: gbismack413491@direct-ehr-ssmhc.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Cep America - Illinois SNF, LLP

  • Internal Medicine Physician
  • Belleville, IL
  • NPI 1073069415
  Medicare reassignment Care Compare group NPD
• Cep America-Illinois Hospitalists, LLP

  • Internal Medicine Physician
  • Belleville, IL
  • NPI 1841613403
  Medicare reassignment Care Compare group NPD
• Galen Inpatient Physicians PC.

  • Hospitalist Physician
  • Fenton, MO
  • NPI 1538714688

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Ste Genevieve County Memorial Hospital

  • Critical Access Hospital
  • Ste Genevieve, MO
  • NPI 1073587655
  Medicare reassignment Care Compare group NPD
• Henry Ford Health System

  • General Acute Care Hospital
  • Detroit, MI
  • NPI 1134144801
  Medicare reassignment NPD
• Sound Inpatient Physicians-Michigan, PLLC

  • Internal Medicine Physician
  • Kalamazoo, MI
  • NPI 1093967861
  Medicare reassignment NPD
• Spectrum Health Primary Care Partners

  dba Corewell Health Medical Group West

  • Internal Medicine Physician
  • Grand Rapids, MI
  • NPI 1235188673
  Medicare reassignment NPD
• Vituity - Michigan Hospitalists PC

  • Hospitalist Physician
  • Lansing, MI
  • NPI 1487278156

  Internal Medicine

  Medicare reassignment NPD
• Med Clinical Practice LLC

  • Internal Medicine Physician
  • Clayton, MO
  • NPI 1699516690
  Medicare reassignment
• Cep America - Illinois SNF LLP

  • Internal Medicine Physician
  • Edwardsville, IL
  • NPI 1043170434
  NPD
• Cep America-Illinois Hospitalists

  • Hospitalist Physician
  • Bloomington, IL
  • NPI 1669276523
  NPD
• Cep America-Illinois Hospitalists, LLP

  • Internal Medicine Physician
  • Shiloh, IL
  • NPI 1619335106
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Osf Healthcare System

  dba Osf Saint Anthony's Health Center

  • General Acute Care Hospital
  • Alton, IL
  • NPI 1710396932
  Care Compare affiliation
• St Elizabeths Hospital of the Hospital Sisters of the Third Order

  dba HSHS St. Elizabeth's Hospital

  • General Acute Care Hospital
  • O'Fallon, IL
  • NPI 1629057302
  Care Compare affiliation
• St Josephs Hospital of the Hospital Sisters of the Third Order of St F

  dba HSHS St. Joseph's Hospital -Highland

  • Critical Access Hospital
  • Highland, IL
  • NPI 1447352323
  Care Compare affiliation
• SSM Health Care St. Louis

  dba SSM Health St. Clare Hospital - Fenton

  • General Acute Care Hospital
  • Fenton, MO
  • NPI 1851496152
  Care Compare affiliation
• Ste Genevieve County Memorial Hospital

  • Medicare Defined Swing Bed Hospital Unit
  • Ste Genevieve, MO
  • NPI 1013054212

  Nursing home

  Care Compare affiliation
• Ste Genevieve County Memorial Hospital

  • Critical Access Hospital
  • Ste Genevieve, MO
  • NPI 1073587655
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1270684800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782086400000",
    "number": "1619293149",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "801 SWARTHMORE LN",
            "city": "UNIVERSITY CITY",
            "state": "MO",
            "postal_code": "631303620",
            "telephone_number": "248-808-2485"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "503 N MAPLE ST",
            "city": "EFFINGHAM",
            "state": "IL",
            "postal_code": "624012006",
            "telephone_number": "217-342-2121"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "401 Corporate Park Dr",
            "address_purpose": "LOCATION",
            "city": "Clayton",
            "state": "MO",
            "postal_code": "631054201",
            "country_code": "US",
            "telephone_number": "636-228-4149",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "2351 Frank Scott Pkwy E",
            "address_purpose": "LOCATION",
            "city": "O Fallon",
            "state": "IL",
            "postal_code": "622697457",
            "country_code": "US",
            "telephone_number": "636-288-4149",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BISMACK",
        "first_name": "GREGORY",
        "middle_name": "THOMAS",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2010-04-08",
        "last_updated": "2026-06-22",
        "certification_date": "2026-06-22",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "MO",
            "license": "2022010983",
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "IL",
            "license": "036155470",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MI",
            "license": "4301097035",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036.155470",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Amanda Lea Bierman, M.D.
• Mary Jo Bierman, APN
• Mary Colleen Bingham, M.D.
• Biomax Rehabilitation Services, Inc
• Roger E. Bishop, M.D.
• David J Bitzer, MD
• BK Services (Utz, Barbara dba BK Services)
• Kevin Zachary Black
• Sandra Susan Blazek, MSW
• Peter Theodorus Bleeker, OTR/L

• Internal Medicine Physician in Effingham, IL
• Providers in Effingham, IL by specialty
• Internal Medicine Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 22, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.