X4 Pharmaceuticals, INC.
Reporting payments is a legal requirement; large totals often reflect large product portfolios.
$325Kgeneral payments (2019-2025)
$18Kresearch payments (2019-2025)
220clinicians paid
General and research payments are shown separately, never blended. Research payments are often institution-directed and tied to clinical trials.
General payments by year
General payments only, as reported to CMS. Research payments are totaled above and not included in these bars.
Products most associated with its payments
Specialties it works with most
Clinicians with the largest reported totals
Often long-running consulting, speaking, or advisory relationships, which companies must report by law. A large total is not evidence of anything improper.
| Clinician | Location | Specialty | General payments (2019-2025) |
|---|---|---|---|
| Serge Alexanian | Los Angeles, CA | Anatomic Pathology & Clinical Pathology | $180,000.00 |
| Mark Fleming | Boston, MA | Hematology (Pathology) | $20,250.00 |
| Niraj Patel | Durham, NC | Pediatric Allergy/Immunology | $18,406.84 |
| Sherif Badawy | Chicago, IL | Pediatric Hematology-Oncology | $14,842.82 |
| Julia Warren | Philadelphia, PA | Pediatric Hematology-Oncology | $13,675.85 |
| Kelly Walkovich | Ann Arbor, MI | Pediatric Hematology-Oncology | $10,444.00 |
| Teresa Tarrant | Chapel Hill, NC | Rheumatology | $10,091.66 |
| Olga Weinberg | Dallas, TX | Anatomic Pathology | $8,800.00 |
| Peter Newburger | Worcester, MA | Pediatric Hematology-Oncology | $7,154.09 |
| Peter Chang | Waltham, MA | Ophthalmology | $6,000.00 |
Source: CMS Open Payments, program years 2019-2025, as reported to CMS by drug and device makers (published June 30, 2026). Drug and device detail covers 2023-2025.