Clarissa S. Geyer, M.D.
NPI 1528264223ActiveIndividual· Internal Medicine, Hematology & Oncology· Morristown, TN
Internal Medicine, Hematology & Oncology (M.D.) with University Health System, Inc., practicing in Morristown, Tennessee. Their prescriptions cost Medicare Part D more than their services did: $1,424,762 for 637 claims, against $19,602 paid for services in 2024. Genentech USA, Inc. was the largest of 33 companies reporting payments in 2025, $2,366 in all, mostly food and beverage. Lists Fort Loudoun Medical Center and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1528264223 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 21, 2007 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | MD0000034568 | TN |
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 - Hematology/Oncology (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 102 |
|---|---|
| Services billed | 255 across 7 procedure codes |
| Paid by Medicare | $19,602 |
Part D prescriptions in 2024
| Prescriptions (claims) | 637 · 934 30-day fills |
|---|---|
| Patients | 81 |
| Total drug cost | $1,424,762 |
| Generic share | 73% of claims |
Education and affiliations
| Graduation year | 1989 |
|---|---|
| Medicare specialty | Hematology/Oncology |
Medical group
- University Health System, Inc.Knoxville, TN · 522 clinicians
Hospital affiliations
- Fort Loudoun Medical CenterLenoir City, TN
- Parkwest Medical CenterKnoxville, TN
- Sweetwater Hospital AssociationSweetwater, TN
- University Health System, IncKnoxville, TN
Industry payments (Open Payments)
- 2025$2,366 · 118 payments from 33 companies
- 2024$1,971 · 88 payments from 28 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genentech USA, Inc. | $254.37 | 12 |
| E.R. Squibb & Sons, L.L.C. | $233.12 | 17 |
| Pfizer Inc. | $201.95 | 10 |
| Eisai Inc. | $159.50 | 8 |
| Novartis Pharmaceuticals Corporation | $156.65 | 10 |
What the 2025 payments were for
- Food and Beverage$2,320 · 116 payments
- Education$45.72 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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