Heather Siobhan Calderwood, PA-C
NPI 1033952270ActiveIndividual· Physician Assistant· Stanford, CA
Physician Assistant (PA-C) with Tmh Physician Associates PLLC, practicing in Stanford, California. Enrolled in Medicare as practitioner - physician assistant and practitioner - physician assistant. Medical Device Business Services, Inc. was the largest of 4 companies reporting payments in 2025, $2,783 in all, mostly travel and lodging. Lists Stanford Health Care as a hospital affiliation.
Overview
| NPI | 1033952270 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | Yes |
| NPI issued | Jun 17, 2024 |
| Last updated in NPPES | Mar 9, 2026 |
| Certified by provider | Mar 9, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 67340 | CA |
| Thoracic Surgery (Cardiothoracic Vascular Surgery) | 208G00000X | PA18400 | TX |
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 - Physician Assistant (CA); Practitioner - Physician Assistant (TX) |
|---|
Education and affiliations
| Graduation year | 2024 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Tmh Physician Associates PLLCKaty, TX · 1,690 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$2,783 · 23 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medical Device Business Services, Inc. | $1,682 | 7 |
| Getinge USA Sales, LLC | $650.13 | 2 |
| Abiomed | $341.99 | 11 |
| Ethicon US, LLC | $108.99 | 3 |
What the 2025 payments were for
- Travel and Lodging$2,071 · 4 payments
- Food and Beverage$712.48 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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