Allen J. Gilson, M.D.
NPI 1346241346ActiveIndividual· Internal Medicine, Geriatric Medicine· Frederick, MD
Internal Medicine, Geriatric Medicine (M.D.) in Frederick, Maryland, trained at Jefferson Medical College of Thomas Jefferson University (class of 1979). Their prescriptions cost Medicare Part D more than their services did: $373,781 for 6,071 claims, against $27,721 paid for services in 2024.
Overview
| NPI | 1346241346 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 2, 2005 |
| Last updated in NPPES | Oct 29, 2026 |
| Certified by provider | Oct 29, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Geriatric Medicine Primary | 207RG0300X | D0026516 | MD |
| Internal Medicine | 207R00000X | D0026516 | MD |
| Internal Medicine, Pulmonary Disease | 207RP1001X | D0026516 | MD |
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 (DC); Practitioner - Geriatric Medicine (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 93 |
|---|---|
| Services billed | 505 across 4 procedure codes |
| Paid by Medicare | $27,721 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,071 · 6,124 30-day fills |
|---|---|
| Patients | 103 |
| Total drug cost | $373,781 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | Jefferson Medical College of Thomas Jefferson University |
|---|---|
| Graduation year | 1979 |
| Medicare specialty | Geriatric Medicine |
| Secondary specialties | Internal Medicine |
Hospital affiliation
- Frederick Health HospitalFrederick, MD
Other facilities
- Home CallHome health agency · Frederick, MD
- Bridginglife, Inc.Hospice · Westminster, MD
- Frederick Health HospiceHospice · Frederick, MD
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Geriatric Medicine providers in Frederick
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- 1649775933
All Internal Medicine, Geriatric Medicine providers in Maryland →