Dr. Chiaching Wang, MD
Hematology (Hematology (Internal Medicine) Physician)
- Medicare participating
At a glance
- Years since graduation
- 21
- In the NPI registry since
- 2008
- Medicare patients seen, 2024
- 115
Licensed in California since 2011, according to the Medical Board of California. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2008Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Hematology (Internal Medicine) Physician primary
CA license A119101 (first issued 2011; current) -
Internal Medicine Physician
CA license A119101 (first issued 2011; current) -
Medical Oncology Physician
CA license A119101 (first issued 2011; current)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- UCSF Medical Center San Francisco, CA
- Zuckerberg San Francisco General Hosp & Trauma Ctr San Francisco, CA
Medical groups
- University of California San Francisco (1,839 clinicians)
- University of California Sfgh Medical Group (587 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 115
- Services billed
- 184
- Patients’ average age
- 66
| Service | Times | Patients |
|---|---|---|
| Diagnostic exam of anus with magnification and chemical agent enhancement using an endoscope | 96 | 81 |
| Biopsy of anus with magnification and chemical agent enhancement using an endoscope | 31 | 27 |
| Simple destruction of growth of anus | 12 | 12 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Ondansetron Hcl Other prescribers in San Francisco, CA | 41 |
| Dexamethasone Other prescribers in San Francisco, CA | 24 |
| Aprepitant | 14 |
| Tagrisso (osimertinib mesylate) | 14 |
| Abiraterone Acetate | 13 |
| Lamivudine Hbv (lamivudine) | 13 |
| Olanzapine Other prescribers in San Francisco, CA | 13 |
| Prednisone Other prescribers in San Francisco, CA | 13 |
| Loperamide (loperamide hcl) Other prescribers in San Francisco, CA | 11 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 1 companies reported 2 payments worth $164 in total to this clinician.
| Genentech, Inc. | $164 |
|---|
| Food and Beverage | $111 |
|---|---|
| Education | $53.45 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Genentech, Inc. Oct 4, 2025 | Education in-kind | $53.45 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.