William C. Chapin, MD
NPI 1083653679ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Portland, OR
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in Portland, Oregon, trained at Medical College of Pennsylvania (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $595,955 for 1,396 claims, against $32,193 paid for services in 2024. Dexcom, Inc. reported $27.88 in payments in 2024, mostly food and beverage.
Overview
| NPI | 1083653679 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 6, 2006 |
| Last updated in NPPES | May 11, 2026 |
| Certified by provider | May 11, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | MD22016 | OR |
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 - Endocrinology (OR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 202 |
|---|---|
| Services billed | 515 across 15 procedure codes |
| Paid by Medicare | $32,193 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,396 · 3,262 30-day fills |
|---|---|
| Patients | 340 |
| Total drug cost | $595,955 |
| Generic share | 45% of claims |
Education and affiliations
| Medical school | Medical College of Pennsylvania |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical groups
- Providence Health and Services OregonPortland, OR · 1,433 clinicians
- Providence Health and Services - OregonPortland, OR · 208 clinicians
Hospital affiliations
- Ohsu Hospital and ClinicsPortland, OR
- Providence Newberg Medical CenterNewberg, OR
- Providence Portland Medical CenterPortland, OR
- Providence St Vincent Medical CenterPortland, OR
- Providence Willamette Falls Medical CenterOregon City, OR
Industry payments (Open Payments)
- 2024$27.88 · 1 payment from 1 company
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Dexcom, Inc. | $27.88 | 1 |
What the 2024 payments were for
- Food and Beverage$27.88 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 63 endocrinologists in Portland · All endocrinologists in Oregon