William Hiesinger, MD
NPI 1093913667ActiveIndividual· Thoracic Surgery (Cardiothoracic Vascular Surgery)· Palo Alto, CA
Thoracic Surgery (Cardiothoracic Vascular Surgery) (MD) in Palo Alto, California, trained at Perelman School of Med at the University of Pennsylvania (class of 2007). Mostly services rather than prescriptions: Medicare paid $159,262 for 68 patients in 2024, with only 20 Part D claims. Abiomed reported $70.53 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1093913667 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 5, 2007 |
| Last updated in NPPES | Apr 27, 2024 |
| Certified by provider | Apr 27, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Thoracic Surgery (Cardiothoracic Vascular Surgery) Primary | 208G00000X | A141989 | CA |
| Surgery | 208600000X | MT191341 | PA |
| Surgery | 208600000X | A141989 | CA |
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 - Thoracic Surgery (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 68 |
|---|---|
| Services billed | 450 across 68 procedure codes |
| Paid by Medicare | $159,262 |
Part D prescriptions in 2024
| Prescriptions (claims) | 20 · 36 30-day fills |
|---|---|
| Total drug cost | $1,282 |
| Generic share | 95% of claims |
Education and affiliations
| Medical school | Perelman School of Med at the University of Pennsylvania |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | Thoracic Surgery |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$70.53 · 1 payment from 1 company
- 2024$237.70 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abiomed | $70.53 | 1 |
What the 2025 payments were for
- Food and Beverage$70.53 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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