Calvin Thomas Williams Jr., M.D. / PH.D
NPI 1023308640ActiveIndividual· Internal Medicine, Infectious Disease· Baltimore, MD
Internal Medicine, Infectious Disease (M.D. / PH.D) in Baltimore, Maryland, trained at University of Maryland School of Medicine (class of 2011). Their prescriptions cost Medicare Part D more than their services did: $2,013,885 for 728 claims, against $99,125 paid for services in 2024. Merck Sharp & Dohme LLC reported $25.70 in payments in 2025, mostly education.
Overview
| NPI | 1023308640 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. / PH.D |
| Sole proprietor | No |
| NPI issued | Apr 15, 2011 |
| Last updated in NPPES | Apr 24, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | D0081038 | MD |
| Internal Medicine | 207R00000X | D0081038 | MD |
| Internal Medicine | 207R00000X | C7-0004863 | DE |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 482 |
|---|---|
| Services billed | 931 across 11 procedure codes |
| Paid by Medicare | $99,125 |
Part D prescriptions in 2024
| Prescriptions (claims) | 728 · 803 30-day fills |
|---|---|
| Patients | 98 |
| Total drug cost | $2,013,885 |
| Generic share | 30% of claims |
Education and affiliations
| Medical school | University of Maryland School of Medicine |
|---|---|
| Graduation year | 2011 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Infectious Disease |
| Telehealth | Offers telehealth |
Medical group
- Medstar Medical Group II LLCWashington, DC · 3,767 clinicians
Hospital affiliations
- Medstar Franklin Square Medical CenterRosedale, MD
- Medstar Good Samaritan HospitalBaltimore, MD
- Medstar Union Memorial HospitalBaltimore, MD
Industry payments (Open Payments)
- 2025$25.70 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $25.70 | 1 |
What the 2025 payments were for
- Education$25.70 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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