Ruth S. Horowitz, MD
NPI 1003811423ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Timonium, MD
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in Timonium, Maryland, trained at University of Cincinnati College of Medicine (class of 1988). Their prescriptions cost Medicare Part D more than their services did: $1,155,573 for 3,116 claims, against $443,208 paid for services in 2024. Corcept Therapeutics was the largest of 27 companies reporting payments in 2025, $1,072 in all, mostly food and beverage.
Overview
| NPI | 1003811423 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 14, 2005 |
| Last updated in NPPES | May 9, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | D45811 | 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 - Endocrinology (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 830 |
|---|---|
| Services billed | 17,940 across 32 procedure codes |
| Paid by Medicare | $443,208 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,116 · 8,343 30-day fills |
|---|---|
| Patients | 511 |
| Total drug cost | $1,155,573 |
| Generic share | 55% of claims |
Education and affiliations
| Medical school | University of Cincinnati College of Medicine |
|---|---|
| Graduation year | 1988 |
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- Privia Medical Group, LLCFairfax, VA · 1,533 clinicians
Hospital affiliations
- Greater Baltimore Medical CenterBaltimore, MD
- Johns Hopkins Hospital, theBaltimore, MD
Industry payments (Open Payments)
- 2025$1,072 · 49 payments from 27 companies
- 2024$1,193 · 58 payments from 25 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $76.87 | 3 |
| Recordati_rare_diseases_inc. | $76.79 | 4 |
| Alexion Pharmaceuticals, Inc. | $68.25 | 3 |
| Novo Nordisk Inc | $61.71 | 3 |
| Radius Health, Inc. | $56.30 | 3 |
What the 2025 payments were for
- Food and Beverage$1,048 · 48 payments
- Education$24.04 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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