Heidi Chang, MD
NPI 1649681982ActiveIndividual· Obstetrics & Gynecology· Walnut Creek, CA
Obstetrics & Gynecology (MD) in Walnut Creek, California, trained at University of Virginia School of Medicine (class of 2012). 135 Medicare patients in 2024, $65,043 paid; nearly all of their 142 Part D prescriptions were generic (95%). Merck Sharp & Dohme LLC was the largest of 8 companies reporting payments in 2025, $1,237 in all, mostly food and beverage.
Overview
| NPI | 1649681982 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | May 8, 2014 |
| Last updated in NPPES | Nov 13, 2024 |
| Certified by provider | Nov 13, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology Primary | 207V00000X | A128445 | 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 - Obstetrics/Gynecology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 135 |
|---|---|
| Services billed | 311 across 50 procedure codes |
| Paid by Medicare | $65,043 |
Part D prescriptions in 2024
| Prescriptions (claims) | 142 · 160 30-day fills |
|---|---|
| Patients | 57 |
| Total drug cost | $3,686 |
| Generic share | 95% of claims |
Education and affiliations
| Medical school | University of Virginia School of Medicine |
|---|---|
| Graduation year | 2012 |
| Medicare specialty | Obstetrics/Gynecology |
| Telehealth | Offers telehealth |
Medical groups
- Emergency and Acute Care Medical CorporationLa Mesa, CA · 422 clinicians
- South Coast Gynecologic Oncology IncSan Diego, CA · 7 clinicians
Hospital affiliations
- Grossmont HospitalLa Mesa, CA
- Sharp Chula Vista Medical CenterChula Vista, CA
- Sharp Coronado Hospital and Hlthcr CtrCoronado, CA
- Sharp Memorial HospitalSan Diego, CA
Industry payments (Open Payments)
- 2025$1,237 · 45 payments from 8 companies
- 2024$163.67 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $458.83 | 18 |
| Astrazeneca Pharmaceuticals LP | $250.84 | 12 |
| Glaxosmithkline, LLC. | $216.41 | 4 |
| Eisai Inc. | $187.78 | 7 |
| Intuitive Surgical, Inc. | $38.67 | 1 |
What the 2025 payments were for
- Food and Beverage$1,228 · 44 payments
- Education$8.65 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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