William John Dahms Jr., D.O.
NPI 1952419376ActiveIndividual· Internal Medicine, Nephrology· Newark, DE
Internal Medicine, Nephrology (D.O.) in Newark, Delaware, trained at Philadelphia College of Osteopathic Medicine (class of 2000). 691 Medicare patients in 2024, $299,300 paid; nearly all of their 1,397 Part D prescriptions were generic (90%). Ardelyx, Inc. was the largest of 24 companies reporting payments in 2025, $2,656 in all, mostly food and beverage.
Overview
| NPI | 1952419376 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Aug 26, 2006 |
| Last updated in NPPES | Jun 17, 2021 |
| Certified by provider | Jun 17, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | C2-0008640 | DE |
| Internal Medicine, Nephrology | 207RN0300X | H0067091 | 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 - Nephrology (DE); Practitioner - Nephrology (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 691 |
|---|---|
| Services billed | 4,679 across 47 procedure codes |
| Paid by Medicare | $299,300 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,397 · 3,733 30-day fills |
|---|---|
| Patients | 243 |
| Total drug cost | $377,364 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | Philadelphia College of Osteopathic Medicine |
|---|---|
| Graduation year | 2000 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Nephrology Associates PAWilmington, DE · 54 clinicians
Hospital affiliations
- Christiana HospitalNewark, DE
- St Francis HospitalWilmington, DE
- Union Hospital of Cecil CountyElkton, MD
Other facilities
- Concerto DelawareDialysis facility · Newark, DE
- Fkc Brandywine Home TherapiesDialysis facility · Newark, DE
- Fkc ChristianaDialysis facility · Newark, DE
- Fkc LantanaDialysis facility · Hockessin, DE
Industry payments (Open Payments)
- 2025$2,656 · 109 payments from 24 companies
- 2024$1,954 · 84 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $277.92 | 11 |
| Amgen Inc. | $269.13 | 14 |
| Calliditas Therapeutics US Inc. | $262.29 | 9 |
| Fresenius USA Marketing, Inc. | $229.11 | 10 |
| Otsuka America Pharmaceutical, Inc. | $213.14 | 9 |
What the 2025 payments were for
- Food and Beverage$2,619 · 107 payments
- Education$37.54 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 28 nephrologists in Newark · All nephrologists in Delaware