Michael Yao-Jen Chang, D.O.
NPI 1205934262ActiveIndividual· Physical Medicine & Rehabilitation, Pain Medicine· Walnut Creek, CA
Physical Medicine & Rehabilitation, Pain Medicine (D.O.) with Golden State Orthopedics and Spine, practicing in Walnut Creek, California. 1,080 Medicare patients in 2024, $401,635 paid; nearly all of their 396 Part D prescriptions were generic (99%). Boston Scientific Corporation was the largest of 3 companies reporting payments in 2025, $252.32 in all, mostly food and beverage. Lists John Muir Medical Center - Concord Campus and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1205934262 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Sep 20, 2006 |
| Last updated in NPPES | Nov 7, 2025 |
| Certified by provider | Nov 7, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physical Medicine & Rehabilitation, Pain Medicine Primary | 2081P2900X | 20A8518 | 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 - Physical Medicine and Rehabilitation (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,080 |
|---|---|
| Services billed | 3,967 across 55 procedure codes |
| Paid by Medicare | $401,635 |
Part D prescriptions in 2024
| Prescriptions (claims) | 396 · 448 30-day fills |
|---|---|
| Patients | 180 |
| Total drug cost | $4,294 |
| Generic share | 99% of claims |
Education and affiliations
| Graduation year | 2002 |
|---|---|
| Medicare specialty | Physical Medicine And Rehabilitation |
| Secondary specialties | Pain Management |
| Telehealth | Offers telehealth |
Medical group
- Golden State Orthopedics and SpineCampbell, CA · 182 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
- Sutter Delta Medical CenterAntioch, CA
Industry payments (Open Payments)
- 2025$252.32 · 6 payments from 3 companies
- 2024$90.75 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Boston Scientific Corporation | $186.88 | 3 |
| Bioventus LLC | $38.51 | 2 |
| Spr Therapeutics, Inc | $26.93 | 1 |
What the 2025 payments were for
- Food and Beverage$252.32 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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