Douglas Kelley Nicholson, DO
NPI 1649273582ActiveIndividual· Internal Medicine, Nephrology· Rock Hill, SC
Internal Medicine, Nephrology (DO) with Nephrology Associates PA, practicing in Rock Hill, South Carolina. 403 Medicare patients in 2024, $223,484 paid; nearly all of their 1,007 Part D prescriptions were generic (93%). Calliditas Therapeutics US Inc. was the largest of 4 companies reporting payments in 2025, $188.54 in all, mostly food and beverage. Lists Musc Health Lancaster Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1649273582 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | May 24, 2005 |
| Last updated in NPPES | Feb 5, 2026 |
| Certified by provider | Feb 5, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 0717 | SC |
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 (NC); Practitioner - Nephrology (SC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 403 |
|---|---|
| Services billed | 3,721 across 72 procedure codes |
| Paid by Medicare | $223,484 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,007 · 2,261 30-day fills |
|---|---|
| Patients | 230 |
| Total drug cost | $70,895 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Nephrology |
Medical group
- Nephrology Associates PARock Hill, SC · 11 clinicians
Hospital affiliations
- Musc Health Lancaster Medical CenterLancaster, SC
- Piedmont Medical CenterRock Hill, SC
Other facilities
- Fmc Bma of Chester IncDialysis facility · Chester, SC
- Fmc of Fort MillDialysis facility · Fort Mill, SC
Industry payments (Open Payments)
- 2025$188.54 · 6 payments from 4 companies
- 2024$70.60 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Calliditas Therapeutics US Inc. | $82.58 | 3 |
| Vantive US Healthcare LLC | $50.94 | 1 |
| Lilly USA, LLC | $29.73 | 1 |
| Ardelyx, Inc. | $25.29 | 1 |
What the 2025 payments were for
- Food and Beverage$188.54 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other nephrologists in Rock Hill
- 1124021076
- 1235335456
- 1508275587
- 1629499785
- 1659469559
- 1891798757
- 1104404060
- 1588613756
- 1891798740
- 1154324093