Kent Alexander Neil Cassmeyer, MD
NPI 1417307505ActiveIndividual· Internal Medicine· O Fallon, MO
Internal Medicine (MD) with Mercy Clinic East Communities and 1 other group, practicing in O Fallon, Missouri. Their prescriptions cost Medicare Part D more than their services did: $622,728 for 8,631 claims, against $45,934 paid for services in 2024. Abbvie Inc. was the largest of 13 companies reporting payments in 2025, $658.30 in all, mostly food and beverage. Lists Mercy Hospital Lincoln and 1 other hospital as hospital affiliations.
Overview
| NPI | 1417307505 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 20, 2016 |
| Last updated in NPPES | Aug 28, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 2019024541 | MO |
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 - Internal Medicine (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 171 |
|---|---|
| Services billed | 543 across 32 procedure codes |
| Paid by Medicare | $45,934 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,631 · 20,601 30-day fills |
|---|---|
| Patients | 580 |
| Total drug cost | $622,728 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2015 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Mercy Clinic East CommunitiesSaint Louis, MO · 571 clinicians
- Aging Well Health Care, LLCSaint Louis, MO · 238 clinicians
Hospital affiliations
- Mercy Hospital LincolnTroy, MO
- Mercy Hospital St LouisSaint Louis, MO
Other facilities
- Aw Health CareHome health agency · Saint Louis, MO
- Mercy Home HealthHome health agency · Saint Louis, MO
- Ssm Health Rehabilitation HospitalInpatient rehabilitation facility · Richmond Heights, MO
Industry payments (Open Payments)
- 2025$658.30 · 35 payments from 13 companies
- 2024$867.83 · 52 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $237.56 | 13 |
| Lilly USA, LLC | $68.60 | 3 |
| Novo Nordisk Inc | $68.44 | 4 |
| Abbott Laboratories | $60.50 | 3 |
| Glaxosmithkline, LLC. | $49.35 | 3 |
What the 2025 payments were for
- Food and Beverage$658.30 · 35 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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