Michael C. Ruddy, M.D.
NPI 1831138015ActiveIndividual· Specialist· Princeton Junction, NJ
Specialist (M.D.) in Princeton Junction, New Jersey, trained at Rutgers New Jersey Medical School (class of 1974). Their prescriptions cost Medicare Part D more than their services did: $166,418 for 2,506 claims, against $90,040 paid for services in 2024. Amgen Inc. was the largest of 10 companies reporting payments in 2025, $341.38 in all, mostly food and beverage.
Overview
| NPI | 1831138015 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 5, 2006 |
| Last updated in NPPES | Jul 13, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | MA31313 | NJ |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (NJ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 246 |
|---|---|
| Services billed | 2,018 across 16 procedure codes |
| Paid by Medicare | $90,040 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,506 · 7,125 30-day fills |
|---|---|
| Patients | 270 |
| Total drug cost | $166,418 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | Rutgers New Jersey Medical School |
|---|---|
| Graduation year | 1974 |
| Medicare specialty | Nephrology |
| Telehealth | Offers telehealth |
Medical group
- Princeton Hypertension-Nephrology Associates L L CPrinceton Junction, NJ · 7 clinicians
Hospital affiliation
- University Medical Center of Princeton at PlainsboroPlainsboro, NJ
Industry payments (Open Payments)
- 2025$341.38 · 19 payments from 10 companies
- 2024$297.66 · 13 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $69.99 | 4 |
| Calliditas Therapeutics US Inc. | $54.78 | 3 |
| Otsuka America Pharmaceutical, Inc. | $42.70 | 2 |
| Novo Nordisk Inc | $39.05 | 2 |
| Ardelyx, Inc. | $33.94 | 2 |
What the 2025 payments were for
- Food and Beverage$341.38 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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