Michael Tzen-Jeh Chang, MD
NPI 1720432016ActiveIndividual· Otolaryngology· Stanford, CA
Otolaryngology (MD) with Stanford Health Care, practicing in Stanford, California. 166 Medicare patients in 2024, $110,053 paid; nearly all of their 109 Part D prescriptions were generic (93%). Medtronic, Inc. was the largest of 4 companies reporting payments in 2025, $372.36 in all, mostly food and beverage. Lists Stanford Health Care as a hospital affiliation.
Overview
| NPI | 1720432016 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 22, 2016 |
| Last updated in NPPES | Apr 28, 2024 |
| Certified by provider | Apr 28, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Otolaryngology Primary | 207Y00000X | A152394 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Otolaryngology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 166 |
|---|---|
| Services billed | 572 across 43 procedure codes |
| Paid by Medicare | $110,053 |
Part D prescriptions in 2024
| Prescriptions (claims) | 109 · 134 30-day fills |
|---|---|
| Patients | 56 |
| Total drug cost | $23,206 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 2016 |
|---|---|
| Medicare specialty | Otolaryngology |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$372.36 · 7 payments from 4 companies
- 2024$183.09 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medtronic, Inc. | $229.39 | 4 |
| Integra Lifesciences Corporation | $83.33 | 1 |
| Astrazeneca Pharmaceuticals LP | $39.27 | 1 |
| Stryker Corporation | $20.37 | 1 |
What the 2025 payments were for
- Food and Beverage$353.93 · 6 payments
- Travel and Lodging$18.43 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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