John Friedewald, MD
NPI 1508801093ActiveIndividual· Internal Medicine, Nephrology· Chicago, IL
Internal Medicine, Nephrology (MD) in Chicago, Illinois, trained at Columbia University College of Physicians and Surgeons (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $170,333 for 1,334 claims, against $55,169 paid for services in 2024. Vertex Pharmaceuticals Incorporated was the largest of 4 companies reporting payments in 2025, $10,931 in all, mostly consulting fees.
Overview
| NPI | 1508801093 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 18, 2006 |
| Last updated in NPPES | Jul 6, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 036113031 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 252 |
|---|---|
| Services billed | 866 across 18 procedure codes |
| Paid by Medicare | $55,169 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,334 · 2,785 30-day fills |
|---|---|
| Patients | 223 |
| Total drug cost | $170,333 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | Columbia University College of Physicians and Surgeons |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Northwestern Medical Faculty FoundationChicago, IL · 4,503 clinicians
Hospital affiliations
- Northwestern Lake Forest HospitalLake Forest, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Memorial HospitalChicago, IL
- Palos Community HospitalPalos Heights, IL
Industry payments (Open Payments)
- 2025$10,931 · 13 payments from 4 companies
- 2024$29,815 · 17 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vertex Pharmaceuticals Incorporated | $5,081 | 6 |
| Sanofi-Aventis U.S. LLC | $3,765 | 4 |
| One Lambda, Inc. | $2,049 | 2 |
| Alexion Pharmaceuticals, Inc. | $34.95 | 1 |
What the 2025 payments were for
- Consulting Fee$4,960 · 4 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$3,504 · 1 payment
- Travel and Lodging$1,441 · 2 payments
- Food and Beverage$1,026 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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