Mark D. Anderson, MD
NPI 1003993163ActiveIndividual· Internal Medicine, Gastroenterology· Knoxville, TN
Internal Medicine, Gastroenterology (MD) in Knoxville, Tennessee, trained at Vanderbilt University School of Medicine (class of 1984). Their prescriptions cost Medicare Part D more than their services did: $52,986 for 45 claims, against $21,809 paid for services in 2024. Janssen Biotech, Inc. was the largest of 3 companies reporting payments in 2025, $116.89 in all, mostly food and beverage.
Overview
| NPI | 1003993163 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 1, 2006 |
| Last updated in NPPES | Feb 4, 2026 |
| Certified by provider | Feb 4, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | MD0000019697 | TN |
| Internal Medicine, Gastroenterology | 207RG0100X | 036174985 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (IL); Practitioner - Gastroenterology (KY); Practitioner - Gastroenterology (SD); Practitioner - Gastroenterology (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 148 |
|---|---|
| Services billed | 224 across 29 procedure codes |
| Paid by Medicare | $21,809 |
Part D prescriptions in 2024
| Prescriptions (claims) | 45 · 45 30-day fills |
|---|---|
| Patients | 28 |
| Total drug cost | $52,986 |
| Generic share | 56% of claims |
Education and affiliations
| Medical school | Vanderbilt University School of Medicine |
|---|---|
| Graduation year | 1984 |
| Medicare specialty | Gastroenterology |
Medical groups
- Baptist Health Medical Group IncMadison, IN · 2,472 clinicians
- Monument Health Rapid City Hospital IncRapid City, SD · 564 clinicians
- Southern Illinois Medical Services NfpCarterville, IL · 334 clinicians
- Knoxville Hma Physician Management, LLCKnoxville, TN · 120 clinicians
- Ferrell Hospital Community FoundationEldorado, IL · 56 clinicians
Hospital affiliations
- Baptist Health PaducahPaducah, KY
- Ferrell Hospital Community FoundationsEldorado, IL
- Herrin HospitalHerrin, IL
- Memorial Hospital of CarbondaleCarbondale, IL
- Monument Health Rapid City HospitalRapid City, SD
Industry payments (Open Payments)
- 2025$116.89 · 7 payments from 3 companies
- 2024$102.82 · 5 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $59.42 | 3 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $39.30 | 2 |
| Phathom Pharmaceuticals, Inc. | $18.17 | 2 |
What the 2025 payments were for
- Food and Beverage$116.89 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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