Janet O'Mahony, M.D.
NPI 1538107073ActiveIndividual· Internal Medicine· Baltimore, MD
Internal Medicine (M.D.) in Baltimore, Maryland, trained at University of Maryland School of Medicine (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $681,054 for 5,364 claims, against $93,455 paid for services in 2024. Novo Nordisk Inc was the largest of 12 companies reporting payments in 2025, $1,444 in all, mostly food and beverage.
Overview
| NPI | 1538107073 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 4, 2006 |
| Last updated in NPPES | Dec 16, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | D0046389 | MD |
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 (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 268 |
|---|---|
| Services billed | 1,737 across 26 procedure codes |
| Paid by Medicare | $93,455 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,364 · 12,033 30-day fills |
|---|---|
| Patients | 330 |
| Total drug cost | $681,054 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | University of Maryland School of Medicine |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Select Rehabilitation, LLCGlenview, IL · 2,046 clinicians
- Maryland Family Care IncReisterstown, MD · 157 clinicians
Hospital affiliations
- Johns Hopkins Bayview Medical CenterBaltimore, MD
- Mercy Medical Center IncBaltimore, MD
Other facilities
- Medstar Health Home CareHome health agency · Baltimore, MD
- Stella Maris, Inc.Home health agency · Timonium, MD
Industry payments (Open Payments)
- 2025$1,444 · 62 payments from 12 companies
- 2024$1,096 · 48 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $443.28 | 18 |
| Astrazeneca Pharmaceuticals LP | $213.23 | 11 |
| Pfizer Inc. | $154.90 | 7 |
| Lilly USA, LLC | $147.37 | 6 |
| Exact Sciences Corporation | $104.31 | 5 |
What the 2025 payments were for
- Food and Beverage$1,444 · 62 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 1,555 internal medicine physicians in Baltimore · All internal medicine physicians in Maryland