David R. Knowles, MD
NPI 1881699908ActiveIndividual· Urology· Mount Vernon, IL
Urology (MD) in Mount Vernon, Illinois, trained at Columbia University College of Physicians and Surgeons (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $1,334,418 for 4,634 claims, against $389,725 paid for services in 2024. Janssen Biotech, Inc. was the largest of 19 companies reporting payments in 2025, $970.00 in all, mostly food and beverage.
Overview
| NPI | 1881699908 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jun 15, 2005 |
| Last updated in NPPES | Apr 20, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Urology Primary | 208800000X | 036114878 | 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 - Urology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,182 |
|---|---|
| Services billed | 24,707 across 90 procedure codes |
| Paid by Medicare | $389,725 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,634 · 10,277 30-day fills |
|---|---|
| Patients | 990 |
| Total drug cost | $1,334,418 |
| Generic share | 91% of claims |
Education and affiliations
| Medical school | Columbia University College of Physicians and Surgeons |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Urology |
| Telehealth | Offers telehealth |
Medical group
- Advanced Urologic Surgeons PCMount Vernon, IL · 2 clinicians
Hospital affiliations
- Fairfield Memorial Hospital 1Fairfield, IL
- Good Samaritan Regional Hlth CenterMount Vernon, IL
- Memorial Hospital of CarbondaleCarbondale, IL
- Salem Township HospitalSalem, IL
- Ssm Health St Mary's Hospital -CentraliaCentralia, IL
Industry payments (Open Payments)
- 2025$970.00 · 50 payments from 19 companies
- 2024$1,032 · 52 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $163.11 | 9 |
| Pfizer Inc. | $91.31 | 5 |
| Novartis Pharmaceuticals Corporation | $90.22 | 4 |
| Bayer Healthcare Pharmaceuticals Inc. | $73.65 | 4 |
| Ferring Pharmaceuticals Inc. | $72.02 | 3 |
What the 2025 payments were for
- Food and Beverage$970.00 · 50 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other urologists in Mount Vernon
- 1417909060
- 1447778642