Warren Orrin Ferris, MD
NPI 1487744280ActiveIndividual· Internal Medicine· Silver Spring, MD
Internal Medicine (MD) in Silver Spring, Maryland, trained at University of Missouri, Columbia School of Medicine (class of 1976). Their prescriptions cost Medicare Part D more than their services did: $664,538 for 670 claims, against $60,126 paid for services in 2024.
Overview
| NPI | 1487744280 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 13, 2006 |
| Last updated in NPPES | Jun 19, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | D31918 | MD |
| Internal Medicine, Rheumatology | 207RR0500X | D31918 | 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 - Rheumatology (DC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 264 |
|---|---|
| Services billed | 2,864 across 15 procedure codes |
| Paid by Medicare | $60,126 |
Part D prescriptions in 2024
| Prescriptions (claims) | 670 · 1,295 30-day fills |
|---|---|
| Patients | 132 |
| Total drug cost | $664,538 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | University of Missouri, Columbia School of Medicine |
|---|---|
| Graduation year | 1976 |
| Medicare specialty | Rheumatology |
| Secondary specialties | Internal Medicine |
Medical group
- Medstar Medical Group II LLCWashington, DC · 3,767 clinicians
Hospital affiliation
- Medstar Montgomery Medical CenterOlney, MD
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 258 internal medicine physicians in Silver Spring · All internal medicine physicians in Maryland