Ahchean A Chen, 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.

• Kaiser Foundation Hospital - Redwood City Hospital · Redwood City, CA · listed as Kaiser Foundation Hospital

Colleagues at Permanente Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 10941 clinicians in the practice; 12 are shown here.

• Synya Kauhane Balanon, MD Military Health Care Provider · Travis AFB, CA
• Dr. Abhijan Banerjee, MD Internal Medicine Physician · San Leandro, CA
• Dr. Richard K Bell, MD Emergency Medicine Physician · Lebanon, OR
• Nelson B Goes, MD Nephrology Physician · Seattle, WA
• David Hensley, MD Psychiatry Physician · San Jose, CA
• Dr. Shannon L Kathol, MD Obstetrics & Gynecology Physician · Sacramento, CA
• Dr. Lisa Law, MD Hematology & Oncology Physician · Roseville, CA
• Mr. Enrique Alfredo Olivella Vives, MFT Marriage & Family Therapist · Palo Alto, CA
• Brent Louis Price, PA-C Physician Assistant · San Francisco, CA
• Dr. Lon Jacobus Taff, MD Obstetrics & Gynecology Physician · Sacramento, CA
• Silvia Teran, MD Obstetrics & Gynecology Physician · Benicia, CA
• Thu Anh Vu Viray, OD Optometrist · Oakland, CA

Other providers in Vallejo

• Diagnostic Pathology Medical Group Inc

  Organization Anatomic Pathology & Clinical Pathology Physician · NPI 1992199160

  300 Hospital Dr, Vallejo, CA 94589-2574 · (916) 447-6267

• Caroline Guevara Yap, MD

  Individual Anatomic Pathology & Clinical Pathology Physician · NPI 1679580351

  2801 Olivewood Ln, Vallejo, CA 94591-6369 · (707) 688-1833