Mack E. McCain, M.D.
NPI 1558321190ActiveIndividual· Internal Medicine, Gastroenterology· Herrin, IL
Internal Medicine, Gastroenterology (M.D.) in Herrin, Illinois, trained at Howard University College of Medicine (class of 1981). Their prescriptions cost Medicare Part D more than their services did: $170,485 for 260 claims, against $65,903 paid for services in 2024. Ardelyx, Inc. was the largest of 2 companies reporting payments in 2025, $34.63 in all, mostly food and beverage.
Overview
| NPI | 1558321190 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Mar 27, 2006 |
| Last updated in NPPES | Sep 27, 2021 |
| Certified by provider | Sep 27, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 36079027 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 304 |
|---|---|
| Services billed | 723 across 43 procedure codes |
| Paid by Medicare | $65,903 |
Part D prescriptions in 2024
| Prescriptions (claims) | 260 · 329 30-day fills |
|---|---|
| Patients | 99 |
| Total drug cost | $170,485 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Howard University College of Medicine |
|---|---|
| Graduation year | 1981 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical groups
- Carle Health Care IncorporatedUrbana, IL · 1,666 clinicians
- Deaconess Illinois Specialty Clinic, Inc.Harrisburg, IL · 148 clinicians
Hospital affiliations
- Carle Foundation HospitalUrbana, IL
- Deaconess Illinois CrossroadsMount Vernon, IL
- Heartland Regional Medical CenterMarion, IL
Industry payments (Open Payments)
- 2025$34.63 · 2 payments from 2 companies
- 2024$420.81 · 11 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $17.97 | 1 |
| Abbvie Inc. | $16.66 | 1 |
What the 2025 payments were for
- Food and Beverage$34.63 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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