Jiwoon Chang, MD
NPI 1952780694ActiveIndividual· Internal Medicine, Pulmonary Disease· Stanford, CA
Internal Medicine, Pulmonary Disease (MD) in Stanford, California, trained at University of California, Geffen School of Medicine (class of 2015). In 2024 Medicare paid $92,480 for 334 patients, and Part D covered 73 of their prescriptions, 37% of them generic. Pulmonx Corporation was the largest of 4 companies reporting payments in 2025, $31,782 in all, mostly consulting fees.
Overview
| NPI | 1952780694 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 27, 2015 |
| Last updated in NPPES | Apr 17, 2024 |
| Certified by provider | Apr 17, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | A154679 | CA |
| Internal Medicine | 207R00000X | A154679 | CA |
| Internal Medicine, Critical Care Medicine | 207RC0200X | A154679 | 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 - Pulmonary Disease (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 334 |
|---|---|
| Services billed | 1,218 across 46 procedure codes |
| Paid by Medicare | $92,480 |
Part D prescriptions in 2024
| Prescriptions (claims) | 73 · 96 30-day fills |
|---|---|
| Patients | 28 |
| Total drug cost | $12,603 |
| Generic share | 37% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | Pulmonary Disease |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliations
- Good Samaritan HospitalSan Jose, CA
- Stanford Health CareStanford, CA
- Stanford Health Care Tri-ValleyPleasanton, CA
Industry payments (Open Payments)
- 2025$31,782 · 25 payments from 4 companies
- 2024$10,602 · 12 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pulmonx Corporation | $19,356 | 19 |
| Ethicon Inc. | $12,390 | 4 |
| Erbe USA Inc | $29.00 | 1 |
| Intuitive Surgical, Inc. | $7.35 | 1 |
What the 2025 payments were for
- Consulting Fee$31,220 · 10 payments
- Food and Beverage$541.42 · 14 payments
- Travel and Lodging$21.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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