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GREGORY THOMAS BISMACK M.D.
NPI 1619293149
Internal Medicine in Effingham, IL

Active since April 08, 2010PECOS EnrolledAccepts Medicare Assignment
503 N MAPLE ST, EFFINGHAM, IL 62401(217) 342-2121 Get Directions Write a Review

NPPES record last updated: June 22, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Dec 5, 2022, Aug 23, 2021, Aug 3, 2021 and 5 more (8 updates tracked since 2017).

About Gregory Thomas Bismack M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GREGORY THOMAS BISMACK M.D. (NPI 1619293149) is an individual internal medicine provider in Effingham, Illinois, licensed in Illinois (036.155470) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS, is affiliated with Osf Saint Anthony's Health Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1619293149
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameGREGORY THOMAS BISMACKCredential: M.D.
Location Address503 N MAPLE STEffingham, IL 62401-2006
Mailing Address801 Swarthmore LnUniversity City, MO 63130-3620 · (248) 808-2485
Phone(217) 342-2121
Sole ProprietorNo
Medical School CMSWayne State University School Of MedicineGraduated 2010
Enumeration DateApril 8, 2010
Last NPPES UpdateJune 22, 20268 updates tracked since enumeration
NPPES CertifiedJune 22, 2026
✔ NPI 1619293149 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in IL · 036.155470✔ Licensed in MI · 4301097035
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedHospitalistTaxonomy 208M00000X · License 2022010983 (MO), 036155470 (IL)
503 N MAPLE ST, Effingham, IL 62401
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Secondary Practice Locations 2

Location 1401 Corporate Park DrClayton, MO 63105-4201 · Phone (636) 228-4149
Location 22351 Frank Scott Pkwy EO Fallon, IL 62269-7457 · Phone (636) 288-4149

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Priority Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Gregory Thomas Bismack M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2466604921
PECOS Enrollment IDI20210512002587, I20220422001066
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

9

Medicare enrollment records show Gregory Bismack reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Cep America-Illinois Hospitalists
0.6 mi
Hospitalist
503 N MAPLE ST
Effingham, IL 62401
  • Reassigned Medicare billing, Illinois enrollment
  • 329 clinicians in this Medicare group
NPI 1174022362 (217) 347-1211
Cep America- Illinois Snf, LLP
63 mi
Internal Medicine
1155 N 1ST ST
Breese, IL 62230
  • Reassigned Medicare billing, Illinois enrollment
  • 51 clinicians in this Medicare group
NPI 1154801744 (618) 526-4521
Med Clinical Practice LLC
102 mi
Internal Medicine
401 CORPORATE PARK DR
Clayton, MO 63105
  • Reassigned Medicare billing, Illinois and Missouri enrollments
  • 4 clinicians in this Medicare group
NPI 1699516690 (716) 292-6551
Galen Inpatient Physicians PC.
112 mi
Hospitalist
1015 BOWLES AVE
Fenton, MO 63026
  • Reassigned Medicare billing, Missouri enrollment
  • 93 clinicians in this Medicare group
NPI 1538714688 (636) 496-2000
Ste Genevieve County Memorial Hospital
113 mi
Critical Access
800 STE GENEVIEVE DR
Ste Genevieve, MO 63670
  • Reassigned Medicare billing, Missouri enrollment
  • 61 clinicians in this Medicare group
NPI 1073587655 (573) 883-2751
Sound Inpatient Physicians-Michigan, PLLC
270 mi
Internal Medicine
1521 GULL RD
Kalamazoo, MI 49048
  • Reassigned Medicare billing, Michigan enrollment
  • 596 clinicians in this Medicare group
NPI 1093967861 (269) 226-7000
Spectrum Health Primary Care Partners
285 mi
Audiologist
588 E LAKEWOOD BLVD
Holland, MI 49424
  • Reassigned Medicare billing, Michigan enrollment
  • 2,446 clinicians in this Medicare group
NPI 1538487400 (616) 494-5860
Vituity - Michigan Hospitalists PC
326 mi
Hospitalist
1215 E MICHIGAN AVE
Lansing, MI 48912
  • Reassigned Medicare billing, Michigan enrollment
  • 115 clinicians in this Medicare group
NPI 1487278156 (517) 364-1000
Henry Ford Health System
364 mi
Pediatrics
2799 W GRAND BLVD
Detroit, MI 48202
  • Reassigned Medicare billing, Michigan enrollment
  • 1,886 clinicians in this Medicare group
NPI 1003990318 (313) 916-2600

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
492 services200 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
243 services236 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
206 services114 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
57 services44 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
36 services36 patients
Advance care planning, first 30 minutes 99497
Advance care planning is a process where you discuss your healthcare preferences with your doctor. This conversation, lasting up to 30 minutes, helps ensure your wishes are respected if you're unable to communicate them in the future. It's about your care, your way.
16 services16 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Osf Saint Anthony's Health Center

Acute Care Hospitals · Alton, IL
2/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140052
LocationSt Anthony's WayAlton, IL 62002 · Madison County

Hshs St Elizabeth's Hospital

Acute Care Hospitals · O Fallon, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140187
LocationOne St Elizabeth BoulevardO Fallon, IL 62269 · St. Clair County
Emergency services Birthing friendly

St Joseph's Hospital

Critical Access Hospitals · Highland, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number141336
Location12866 Troxler AvenueHighland, IL 62249 · Madison County
Emergency services

Ssm St Clare Health Center

Acute Care Hospitals · Fenton, MO
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260081
Location1015 BowlesFenton, MO 63026 · Jefferson County
Emergency services Birthing friendly

Ste Genevieve County Memorial Hospital

Critical Access Hospitals · Sainte Genevieve, MO
OwnershipGovernment - Hospital District or Authority
CMS Certification Number261330
Location800 Ste Genevieve Drive, PO Box 468Sainte Genevieve, MO 63670 · Ste. Genevieve County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 62401 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$127.46 typical visit price
range $54.80 – $168.44
Typical copayment $31.86 (range $13.70 – $42.11)
Most-billed visit code 99204
Established Patient
$97.25 typical visit price
range $17.16 – $136.56
Typical copayment $24.31 (range $4.29 – $34.14)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 4

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
3 suppliers74 claims74 services$17.98 avg. paid by Medicare
Home ventilator, any type, used with non-invasive interface, (e.g., mask, chest shell) E0466
DME-Other DME · category DE005N
1 supplier15 claims15 services$919.30 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
6 suppliers90 claims90 services$97.10 avg. paid by Medicare
Portable oxygen concentrator, rental E1392
DME-Oxygen and Supplies · category DC002N
2 suppliers14 claims14 services$34.13 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CROSSROADS EMERGENCY PHYSICIANS, LLP
Emergency Medicine
503 N MAPLE ST
EFFINGHAM, IL 62401
Effingham County (217) 342-2121
CHRISTIE M CLARK OT
Occupational Therapist
503 N MAPLE ST
EFFINGHAM, IL 62401
Effingham County (217) 347-1243
JAMES ELLIS D.O., FACEP
Emergency Medicine
503 N MAPLE ST
EFFINGHAM, IL 62401
Effingham County (217) 337-2000
BETHANY RENEE STONE
Nurse Practitioner (Family)
503 N MAPLE ST
EFFINGHAM, IL 62401
Effingham County (217) 347-1211
CHARIECE LASALLE ROBINSON MD
Hospitalist
503 N MAPLE ST
EFFINGHAM, IL 62401
Effingham County (217) 347-6127
LINDA CHENG C.R.N.A.
Nurse Anesthetist, Certified Registered
503 N MAPLE ST
EFFINGHAM, IL 62401
Effingham County (217) 342-2121
CEP AMERICA-ILLINOIS HOSPITALISTS
Hospitalist
503 N MAPLE ST
EFFINGHAM, IL 62401
Effingham County (217) 347-1211
ST ANTHONYS MEMORIAL HOSPITAL OF THE HOSPITAL SISTERS OF THE THIRD
General Acute Care Hospital
503 N MAPLE ST
EFFINGHAM, IL 62401
Effingham County (217) 347-1243

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Bismack's NPI number?

The NPI number for Gregory Bismack is 1619293149. It was assigned to this individual provider in the NPPES registry on April 8, 2010.

Where is Gregory Bismack located?

Gregory Bismack practices at 503 N Maple St, Effingham, IL 62401. The listed phone number is (217) 342-2121.

What is Gregory Bismack's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Gregory Bismack enrolled in Medicare?

Yes. Gregory Bismack is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Gregory Bismack's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Bismack reassigns Medicare benefits to 9 organizations: Cep America-Illinois Hospitalists (Effingham, IL), Cep America- Illinois Snf, LLP (Breese, IL), Med Clinical Practice LLC (Clayton, MO), Galen Inpatient Physicians PC. (Fenton, MO), Ste Genevieve County Memorial Hospital (Ste Genevieve, MO) and 4 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregory Bismack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Bismack accept?

Health plans from Anthem Blue Cross and Blue Shield and Priority Health list Gregory Bismack as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Gregory Bismack affiliated with any hospitals?

According to CMS data, Gregory Bismack is affiliated with Osf Saint Anthony's Health Center, Hshs St Elizabeth's Hospital, St Joseph's Hospital, Ssm St Clare Health Center and Ste Genevieve County Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Gregory Bismack was last updated on June 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.