Irene Joan Chang, M.D.
Medical Genetics, Clinical Genetics (M.D.) (M.D.) with University of California San Francisco and 1 other group, practicing in San Francisco, California. Their prescriptions cost Medicare Part D more than their services did: $1,590,399 for 47 claims, against $3,706 paid for services in 2024. Biomarin Pharmaceutical Inc. was the largest of 4 companies reporting payments in 2025, $9,587 in all, mostly consulting fees. Lists UCSF Medical Center as a hospital affiliation.
Overview
| NPI | 1033539671 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 22, 2014 |
| Last updated in NPPES | Aug 29, 2024 |
| Certified by provider | Aug 29, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Medical Genetics, Clinical Genetics (M.D.) Primary | 207SG0201X | A186751 | CA |
| Medical Genetics, Clinical Genetics (M.D.) | 207SG0201X | 60654898 | WA |
| Medical Genetics, Clinical Biochemical Genetics | 207SG0202X | MD60654898 | WA |
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 - Pediatric Medicine (CA); Practitioner - Medical Genetics and Genomics (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 15 |
|---|---|
| Services billed | 66 across 3 procedure codes |
| Paid by Medicare | $3,706 |
Part D prescriptions in 2024
| Prescriptions (claims) | 47 · 47 30-day fills |
|---|---|
| Total drug cost | $1,590,399 |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Pediatric Medicine |
| Telehealth | Offers telehealth |
Medical groups
- University of California San FranciscoSan Francisco, CA · 1,839 clinicians
- UCSF Pediatrics AssociatesSan Francisco, CA · 92 clinicians
Hospital affiliation
- UCSF Medical CenterSan Francisco, CA
Industry payments (Open Payments)
- 2025$9,587 · 7 payments from 4 companies
- 2024$38.00 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Biomarin Pharmaceutical Inc. | $5,475 | 4 |
| Chiesi USA, Inc. | $4,025 | 1 |
| Stryker Corporation | $68.56 | 1 |
| Avita Medical Americas, LLC | $18.68 | 1 |
What the 2025 payments were for
- Consulting Fee$5,475 · 4 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$4,025 · 1 payment
- Food and Beverage$87.24 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 18 Medical Genetics, Clinical Genetics (M.D.) providers in San Francisco · All Medical Genetics, Clinical Genetics (M.D.) providers in California