Dr. Samuel CHI Knight Zhang, MD

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

• Torrance Memorial Medical Center Hospital · Torrance, CA

Colleagues at Torrance Memorial Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 52 clinicians in the practice; 12 are shown here.

• Dr. Bryan Chang, MD Therapeutic Radiology Physician · Torrance, CA
• Saadia Riaz Chaudhary, MD Diagnostic Radiology Physician · Pasadena, CA
• Dr. Thyra J. Endicott, MD Radiation Oncology Physician · Redondo Beach, CA
• Steven Douglas Fisher, MD Surgery Physician · Torrance, CA
• Usama Mahmood, MD Radiation Oncology Physician · Fountain Valley, CA
• John K McKissock, MD Plastic Surgery Physician · Torrance, CA
• Charles M. Mehringer, MD Neuroradiology Physician · Torrance, CA
• Dr. Vimal Murthy, MD Surgery Physician · Torrance, CA
• Rebecca Grace Philipson, MD Student in an Organized Health Care Education/Training Program · Torrance, CA
• Matthew J Reiss, MD Plastic Surgery Physician · Manhattan Beach, CA
• Dr. Andrew Schumacher, MD Radiation Oncology Physician · Torrance, CA
• John M Stoneburner Jr., MD Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Torrance, CA

Other providers in Torrance

• Garth A Green

  Individual Radiation Oncology Physician · NPI 1366426421

  5215 Torrance Blvd, Torrance, CA 90503 · (310) 750-1715

• Dr. Andrew Schumacher, MD

  Individual Radiation Oncology Physician · NPI 1023457173

  3330 Lomita Blvd, Torrance, CA 90505-5002 · (310) 517-4750

• Dr. Thomas Simko, MD

  Individual Radiation Oncology Physician · NPI 1558382465

  3330 Lomita Blvd, Torrance, CA 90505-5002 · (909) 263-0321

• Valley Radiotherapy Associates Medical Group Inc

  Organization Radiation Oncology Physician · NPI 1073776746

  3531 Fashion Way, Torrance, CA 90503-4807 · (310) 303-6539

• Arthur Zimmerman, MD

  Individual Radiation Oncology Physician · NPI 1154464337

  1000 W Carson St Box 480, Torrance, CA 90502-2004 · (310) 222-2804