James A. Groff, DO
NPI 1912959107ActiveIndividual· Internal Medicine, Nephrology· Lancaster, PA
Internal Medicine, Nephrology (DO) in Lancaster, Pennsylvania, trained at Philadelphia College of Osteopathic Medicine (class of 1991). 571 Medicare patients in 2024, $123,882 paid; nearly all of their 2,015 Part D prescriptions were generic (96%). Amgen Inc. was the largest of 5 companies reporting payments in 2025, $301.16 in all, mostly food and beverage.
Overview
| NPI | 1912959107 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | May 16, 2006 |
| Last updated in NPPES | Dec 2, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | OS-007680-L | 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 - Internal Medicine (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 571 |
|---|---|
| Services billed | 1,550 across 27 procedure codes |
| Paid by Medicare | $123,882 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,015 · 4,957 30-day fills |
|---|---|
| Patients | 670 |
| Total drug cost | $143,207 |
| Generic share | 96% of claims |
Education and affiliations
| Medical school | Philadelphia College of Osteopathic Medicine |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Neurology |
Medical group
- Nephrology Associates of Lancaster, LtdStevens, PA · 20 clinicians
Hospital affiliations
- Lancaster General HospitalLancaster, PA
- Penn State Health Lancaster Medical CenterLancaster, PA
- Wellspan Ephrata Community HospitalEphrata, PA
- Wellspan Good Samaritan HospitalLebanon, PA
Other facilities
- Davita Elizabethtown DialysisDialysis facility · Elizabethtown, PA
- Davita Pdi LancasterDialysis facility · Lancaster, PA
Industry payments (Open Payments)
- 2025$301.16 · 13 payments from 5 companies
- 2024$208.13 · 5 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $150.72 | 6 |
| Fresenius USA Marketing, Inc. | $62.90 | 3 |
| Ardelyx, Inc. | $40.01 | 2 |
| Novartis Pharmaceuticals Corporation | $26.69 | 1 |
| Otsuka America Pharmaceutical, Inc. | $20.84 | 1 |
What the 2025 payments were for
- Food and Beverage$301.16 · 13 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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