John Chang, MD
NPI 1598704827ActiveIndividual· Anesthesiology· Mission Viejo, CA
Anesthesiology (MD) in Mission Viejo, California, trained at Jefferson Medical College of Thomas Jefferson University (class of 1996). Medicare paid $49,845 for services to 351 patients in 2024. Celltrion USA Inc. reported $20.54 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1598704827 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 5, 2006 |
| Last updated in NPPES | Feb 12, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Anesthesiology Primary | 207L00000X | A65638 | 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 - Anesthesiology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 351 |
|---|---|
| Services billed | 365 across 53 procedure codes |
| Paid by Medicare | $49,845 |
Education and affiliations
| Medical school | Jefferson Medical College of Thomas Jefferson University |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Anesthesiology |
Medical group
- Western Anesthesia Medical Associates IncMission Viejo, CA · 49 clinicians
Hospital affiliation
- Providence Mission HospitalMission Viejo, CA
Industry payments (Open Payments)
- 2025$20.54 · 1 payment from 1 company
- 2024$619.12 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Celltrion USA Inc. | $20.54 | 1 |
What the 2025 payments were for
- Food and Beverage$20.54 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 41 anesthesiologists in Mission Viejo · All anesthesiologists in California