NPPES file of Aug 9, 2026

Gregory Thomas Bismack, M.D.

Internal Medicine Physician · Effingham, IL

Gregory Thomas Bismack, M.D. is an internal medicine physician with a practice address in Effingham, Illinois, and NPI 1619293149, issued on Apr 8, 2010. Check the license (Illinois 036.155470, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1619293149
Name
Gregory Thomas Bismack
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License numbers
036.155470 IL
036155470 IL
4301097035 MI
2022010983 MO
Self-reported in NPPES; status is on the state search
Practice location
503 N Maple St, Effingham, IL 62401
Phone
(217) 342-2121
Enumerated
Apr 8, 2010
Record last updated
Jun 22, 2026
Medicare enrollment
Enrolled (PECOS I20210512002587); accepts Medicare assignment
Medical or professional school
Wayne State University School Of Medicine, 2010
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →

Also registered at 503 N Maple St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Amanda Baker, PT, DPTPhysical Therapist1205487790
  2. Sheri Barnett, APNAdult Health Nurse Practitioner1871995472
  3. Peter Bleeker, OTR/LOccupational Therapist1801144100
  4. Laura Brown, PTPhysical Therapist1568789683
  5. Karen Buescher, M.S.,CCC-SLPSpeech-Language Pathologist1588912877
  6. Donna Cheney, PTPhysical Therapist1912224361

Verify Gregory Thomas Bismack in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
    Search for license 036.155470    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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82% fewer Medicare Part D claims than the average internal medicine physician in 2024

571 Medicare Part D claims for 241 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 34 claims were for opioids.

  1. Gregory Bismack571
  2. Specialty average3,176

Most prescribed

  1. Eliquis32 claims
  2. Furosemide31 claims
  3. Atorvastatin Calcium30 claims
  4. Metoprolol Succinate30 claims
  5. Amlodipine Besylate25 claims
  6. Prednisone25 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

4 hospitals and group practices

  1. Ste Genevieve County Memorial HospitalSte Genevieve, MO · Critical Access Hospitals4 of 5 stars
  2. Cep America - Illinois Snf LLPBelleville, IL
  3. Cep America-Illinois Hospitalists, LLPEffingham, IL
  4. Galen Inpatient Physicians PCBridgeton, MO

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Gregory Thomas Bismack among 7,238 internal medicine physician records in Illinois

Gregory Thomas Bismack, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 51% of them.

  • NPI issued2010 · 51% of these records are older, 47% newer
  • In a Medicare fileYes · 73% of these records are
  • In the CMS Doctors and Clinicians fileYes · 50% of these records are
  • Graduated2010 · median 2003 among the 3,580 with a school on file
  • Record last updated2026 · 47% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

10 internal medicine physician records list a practice address in Effingham

They are 10 of the 566 NPPES records with a practice address in Effingham, and 7,238 internal medicine physician records in Illinois.

All 7,238 in Illinois → Every provider in Effingham → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Narinder Arora, M.D.Effingham, IL 624011477576924
  2. Navdip Arora, M.D.Effingham, IL 624011902117328
  3. Elene Awad, MD PHDEffingham, IL 624011477543601
  4. Thomas Heischmidt, M.D.Effingham, IL 624011396720983
  5. David Kowalski, M.D.Effingham, IL 624011538194600
  6. Rita Maldonado, M.D.Effingham, IL 624011154407039
  7. Jennifer Maneja, MDEffingham, IL 624011194775064
  8. Lalaine Ramirez-Hom, M.D.Effingham, IL 624011669408209

Common questions

What is Gregory Thomas Bismack, M.D.'s NPI number?

Gregory Thomas Bismack, M.D.'s National Provider Identifier (NPI) is 1619293149, issued on Apr 8, 2010. An NPI identifies a provider in billing; it is not a license.

Where is Gregory Thomas Bismack, M.D. located?

The NPPES record lists a practice address at 503 N Maple St, Effingham, IL, 62401. Phone: (217) 342-2121. Providers update this record themselves, so call before visiting.

How can I verify Gregory Thomas Bismack, M.D.'s license?

NPPES lists Illinois license number 036.155470, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Gregory Thomas Bismack, M.D. prescribe under Medicare Part D?

In 2024, Gregory Thomas Bismack, M.D. had 571 Medicare Part D claims for 241 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.