WILLIAM THOMAS CHANG
Allopathic & Osteopathic Physicians|Anesthesiology|Pain Medicine IOWA CITY, IA NPI 1770112609
Browse related groups: Allopathic & Osteopathic Physicians|Anesthesiology|Pain Medicine IA Medtronic, Inc. All categories
General Payments — all program years on this page
$3,942.84
- Category: General Payments
- Program years: PY2022–2024
- Record count: 29
- As of (CMS publication): 2026-01-23
Latest program year (PY2024): $3,415.66 across 25 records · disputed records: 0
Financial relationships do not necessarily indicate an improper relationship; the data is open to interpretation.
How this figure is calculated
- The total is the sum of the General Payments records CMS published for the labeled program year(s), exactly as published. Nothing is estimated, weighted, or combined across categories.
- General Payments only. Research and Ownership/Investment are separate datasets and are never summed with these figures; amounts are kept separate per program year.
- Featured-page threshold (a presentation gate, not a judgment): records>=3 OR total>=100 (all years).
- Methodology & Data — sourcing, labeling, and limitations.
By nature of payment
Latest program year (PY2024) · sorted by reported total.
| Nature of payment | Amount | Records |
|---|---|---|
| Grant | $2,000.00 | 1 |
| Food and Beverage | $717.92 | 15 |
| Travel and Lodging | $697.74 | 9 |
By paying entity
Latest program year (PY2024) · sorted by reported total.
| Paying entity | Amount | Records |
|---|---|---|
| Medtronic, Inc. | $3,083.98 | 22 |
| BOSTON SCIENTIFIC CORPORATION | $144.54 | 1 |
| Merz Pharmaceuticals, LLC | $106.46 | 1 |
| Vertos Medical, Inc. | $80.68 | 1 |
By program year
Records — PY2024 (25)
Provenance & corrections
- Dataset: CMS Open Payments — General Payments
- Source: CMS Open Payments dataset (bulk file)
- Publisher of source data: Centers for Medicare & Medicaid Services
- Generated from: OP_DTL_GNRL_PGYR2024_P01232026_01102026.csv
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Corrections to the substance of a record route to CMS through its review-and-dispute process; errors in how this site mirrors or displays a record route to us. Both paths are described in Methodology & Data.