GREGORY THOMAS BISMACK (M.D.) – Internal Medicine Physician, NPI 1619293149
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
2,390 HOSPITALIST in IL
Provider Addresses for GREGORY THOMAS BISMACK (M.D.)
801 SWARTHMORE LN
UNIVERSITY CITY, MO 631303620
Phone: (248) 808-2485
Type: Mailing
503 N MAPLE ST
EFFINGHAM, IL 624012006
Phone: (217) 342-2121
Type: Location
405 ARBOR VW
BRANDON, MS 390477073
Phone: (248) 808-2485
Type: Mailing
Flowood Drive, Flowood, Rankin County, Mississippi, 39232, United States
FLOWOOD, MS 392329307
Phone: (601) 376-2832
Fax: (601) 932-1260
Type: Mailing
Merit Health River Oaks, 1030, River Oaks Drive, Wells, Flowood, Rankin County, Mississippi, 39232, United States
FLOWOOD, MS 392329553
Phone: (601) 376-2832
Fax: (601) 936-1260
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $24.
Total Amount is formed as General ($24) + Research ($0) + Ownership ($0) = $24.
Last reported payment date: 2023-08-14 • Largest payer in this snapshot: ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) ($24).
Total Amount
$24
General + Research + Ownership
Payments
1
Total payment records
General Amount
$24
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-08-14
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) | $24 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2022-04-22
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 3 Medicare enrollment records; no due dates published yet.
Enrollment records
3
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20140326000988 | I | Internal Medicine | MI | TBD |
| I20210512002587 | I | Hospitalist | IL | TBD |
| I20220422001066 | I | Hospitalist | MO | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 451 | 256 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 245 | 238 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 222 | 213 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 66 | 48 | $0 |
| 99238 | Hospital discharge day management, 30 minutes or less | 47 | 47 | $0 |
Insurance plans in this area (ZIP 63130)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IL | |
| Internal Medicine | IL | |
| Family Practice, Hospitalist | WI | |
| H O S P I T A L I S T | IL | |
| Physician Assistant | IL | |
| Internal Medicine | IL | |
| Family Practice, Hospitalist | MO | |
| Physician Assistant | MO | |
| H O S P I T A L I S T | IL | |
| Nurse Practitioner | IL |
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