Nicholas John Mayer, D.O.
NPI 1104075597ActiveIndividual· Internal Medicine, Nephrology· Florissant, MO
Internal Medicine, Nephrology (D.O.) in Florissant, Missouri, trained at At Still University of Health Sciences, College of Osteo Med, Kirksville (class of 2004). Their prescriptions cost Medicare Part D more than their services did: $906,852 for 4,743 claims, against $109,587 paid for services in 2024. Otsuka America Pharmaceutical, Inc. was the largest of 9 companies reporting payments in 2025, $559.45 in all, mostly food and beverage.
Overview
| NPI | 1104075597 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Sep 10, 2008 |
| Last updated in NPPES | May 22, 2024 |
| Certified by provider | May 22, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 2009007663 | MO |
| Internal Medicine, Nephrology | 207RN0300X | 036123985 | 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 - Internal Medicine (IL); Practitioner - Internal Medicine (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 237 |
|---|---|
| Services billed | 1,179 across 19 procedure codes |
| Paid by Medicare | $109,587 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,743 · 11,915 30-day fills |
|---|---|
| Patients | 453 |
| Total drug cost | $906,852 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | At Still University of Health Sciences, College of Osteo Med, Kirksville |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Nephrology |
| Telehealth | Offers telehealth |
Medical group
- St Louis Kidney Care LLCFlorissant, MO · 8 clinicians
Hospital affiliations
- Alton Memorial HospitalAlton, IL
- Christian Hospital NortheastSaint Louis, MO
- Gateway Regional Medical CenterGranite City, IL
- Memorial HospitalBelleville, IL
- Ssm Health Depaul Hospital St LouisBridgeton, MO
Other facilities
- Bma St. LouisDialysis facility · Saint Ann, MO
- Fresenius of NormandyDialysis facility · Normandy, MO
- Metro Dialysis Center - NorthDialysis facility · Florissant, MO
Industry payments (Open Payments)
- 2025$559.45 · 12 payments from 9 companies
- 2024$904.78 · 18 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Otsuka America Pharmaceutical, Inc. | $176.61 | 3 |
| Travere Therapeutics, Inc. | $124.98 | 1 |
| Glaxosmithkline, LLC. | $121.82 | 1 |
| Opko Pharmaceuticals, LLC | $33.72 | 2 |
| Lilly USA, LLC | $28.83 | 1 |
What the 2025 payments were for
- Food and Beverage$559.45 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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