Bayard Won Chang, M.D.
NPI 1104816255ActiveIndividual· Internal Medicine· Sacramento, CA
Internal Medicine (M.D.) in Sacramento, California, trained at Georgetown University School of Medicine (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $654,795 for 7,054 claims, against $289,922 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 7 companies reporting payments in 2025, $319.55 in all, mostly food and beverage.
Overview
| NPI | 1104816255 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Oct 28, 2005 |
| Last updated in NPPES | Jan 25, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G064347 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 427 |
|---|---|
| Services billed | 10,095 across 37 procedure codes |
| Paid by Medicare | $289,922 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,054 · 14,063 30-day fills |
|---|---|
| Patients | 407 |
| Total drug cost | $654,795 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Georgetown University School of Medicine |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Marshall Medical CenterPlacerville, CA · 176 clinicians
Hospital affiliations
- Sutter Davis HospitalDavis, CA
- Sutter Medical Center, SacramentoSacramento, CA
- Sutter Roseville Medical CenterRoseville, CA
Other facilities
- Sonder Home Health CareHome health agency · Sacramento, CA
- Sutter Care at HomeHome health agency · Roseville, CA
- Sutter Care at HomeHome health agency · Sacramento, CA
Industry payments (Open Payments)
- 2025$319.55 · 13 payments from 7 companies
- 2024$434.99 · 19 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $112.12 | 4 |
| Pfizer Inc. | $66.52 | 3 |
| Boston Scientific Corporation | $43.26 | 1 |
| Exact Sciences Corporation | $38.41 | 2 |
| Lilly USA, LLC | $23.51 | 1 |
What the 2025 payments were for
- Food and Beverage$319.55 · 13 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Sacramento
- 1003104118
- 1013022433
- 1013538982
- 1023463338
- 1033154018
- 1033774104
- 1043268014
- 1043870942
- 1053388900
- 1053781633
- 1053791442
- 1063455210
All 652 internal medicine physicians in Sacramento · All internal medicine physicians in California