Jon William Mares, D.O.
NPI 1023375300ActiveIndividual· Internal Medicine, Nephrology· Covington, LA
Internal Medicine, Nephrology (D.O.) in Covington, Louisiana, trained at Kansas City University of Physicians and Surgeons (class of 2012). 65 Medicare patients in 2024, $29,478 paid; nearly all of their 132 Part D prescriptions were generic (99%). Bayer Healthcare Pharmaceuticals Inc. was the largest of 4 companies reporting payments in 2025, $1,128 in all, mostly food and beverage.
Overview
| NPI | 1023375300 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Apr 11, 2012 |
| Last updated in NPPES | Sep 17, 2025 |
| Certified by provider | Sep 17, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 036.151545 | IL |
| Internal Medicine | 207R00000X | Q6769 | TX |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (LA); Practitioner - Nephrology (MS) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 65 |
|---|---|
| Services billed | 194 across 10 procedure codes |
| Paid by Medicare | $29,478 |
Part D prescriptions in 2024
| Prescriptions (claims) | 132 · 298 30-day fills |
|---|---|
| Patients | 31 |
| Total drug cost | $2,349 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | Kansas City University of Physicians and Surgeons |
|---|---|
| Graduation year | 2012 |
| Medicare specialty | Nephrology |
Medical group
- Nni Covington LLCCovington, LA · 6 clinicians
Hospital affiliation
- North Oaks Medical CenterHammond, LA
Other facilities
- Fkc - Tchefuncte RiverDialysis facility · Madisonville, LA
Industry payments (Open Payments)
- 2025$1,128 · 11 payments from 4 companies
- 2024$81.69 · 4 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $886.32 | 8 |
| Novo Nordisk Inc | $129.37 | 1 |
| Aurinia Pharma U.S., Inc. | $98.40 | 1 |
| Amgen Inc. | $13.63 | 1 |
What the 2025 payments were for
- Food and Beverage$1,128 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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