William Joseph Chapin, MD
NPI 1316309578ActiveIndividual· Internal Medicine, Hematology & Oncology· Philadelphia, PA
Internal Medicine, Hematology & Oncology (MD) in Philadelphia, Pennsylvania, trained at University of Chicago, Pritzker School of Medicine (class of 2016). Their prescriptions cost Medicare Part D more than their services did: $77,416 for 200 claims, against $31,031 paid for services in 2024. Intera Oncology, Inc was the largest of 4 companies reporting payments in 2025, $754.76 in all, mostly food and beverage.
Overview
| NPI | 1316309578 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Mar 25, 2016 |
| Last updated in NPPES | Dec 8, 2022 |
| Certified by provider | Dec 8, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | MD470979 | PA |
| Internal Medicine | 207R00000X | MD470979 | PA |
| Internal Medicine, Medical Oncology | 207RX0202X | MD470979 | PA |
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 - Hematology/Oncology (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 97 |
|---|---|
| Services billed | 475 across 16 procedure codes |
| Paid by Medicare | $31,031 |
Part D prescriptions in 2024
| Prescriptions (claims) | 200 · 240 30-day fills |
|---|---|
| Patients | 43 |
| Total drug cost | $77,416 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | University of Chicago, Pritzker School of Medicine |
|---|---|
| Graduation year | 2016 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- University of Penn - Medical GroupPhiladelphia, PA · 3,505 clinicians
Hospital affiliations
- Hospital of Univ of PennsylvaniaPhiladelphia, PA
- Penn Presbyterian Medical CenterPhiladelphia, PA
Other facilities
- Penn Medicine Home HealthHome health agency · Bala Cynwyd, PA
- Penn Medicine HospiceHospice · Bala Cynwyd, PA
Industry payments (Open Payments)
- 2025$754.76 · 6 payments from 4 companies
- 2024$115.06 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Intera Oncology, Inc | $499.15 | 2 |
| Genentech USA, Inc. | $116.45 | 1 |
| Genentech, Inc. | $79.00 | 1 |
| Caris Mpi, Inc. | $60.16 | 2 |
What the 2025 payments were for
- Food and Beverage$754.76 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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