William Sanderson Twaddell, M.D.
NPI 1538296124ActiveIndividual· Pathology, Anatomic Pathology & Clinical Pathology· Baltimore, MD
Pathology, Anatomic Pathology & Clinical Pathology (M.D.) in Baltimore, Maryland, trained at Columbia University College of Physicians and Surgeons (class of 2004). Medicare paid $88,358 for services to 841 patients in 2024.
Overview
| NPI | 1538296124 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 28, 2007 |
| Last updated in NPPES | May 7, 2026 |
| Certified by provider | May 7, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Pathology, Anatomic Pathology & Clinical Pathology Primary | 207ZP0102X | D68076 | MD |
| Pathology, Anatomic Pathology | 207ZP0101X | 242497-1 | NY |
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 - Pathology (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 841 |
|---|---|
| Services billed | 2,890 across 25 procedure codes |
| Paid by Medicare | $88,358 |
Education and affiliations
| Medical school | Columbia University College of Physicians and Surgeons |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Pathology |
Medical groups
- Chester River Hospital CenterChestertown, MD · 28 clinicians
- Univ of MD Pathology Associates P ABaltimore, MD · 24 clinicians
- Digestive Disease Solutions LLCGermantown, MD · 3 clinicians
Hospital affiliations
- Johns Hopkins Howard County Medical CenterColumbia, MD
- University of Maryland Medical CenterBaltimore, MD
- University of MD Charles Regional Medical CenterLa Plata, MD
- University of MD Medical Center Midtown CampusBaltimore, MD
- University of MD Shore Medical Center at EastonEaston, 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 177 pathologists in Baltimore · All pathologists in Maryland