William John Marks, MD

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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.

• Stanford Health Care Hospital · Stanford, CA

Colleagues at Stanford Health Care

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3085 clinicians in the practice; 12 are shown here.

• Emily Chan, MD Anatomic Pathology Physician · Stanford, CA
• Ann K Folkins, MD Anatomic Pathology & Clinical Pathology Physician · Stanford, CA
• Lori Henry, NP Acute Care Nurse Practitioner · Stanford, CA
• Karen Genevieve Hirsch, MD Neurology Physician · Stanford, CA
• Kathie S Lin, MD Neurology Physician · Stanford, CA
• Marie Lapenta McHenry, MD Anesthesiology Physician · Stanford, CA
• Marie Cardine Preval, NP Nurse Practitioner · Stanford, CA
• Kavitha Pandy Raj, MD Hematology (Internal Medicine) Physician · Pleasanton, CA
• Jeremy Lee Stanek, MD Physical Medicine & Rehabilitation Physician · Stanford, CA
• Derrick Check Wan, MD Plastic and Reconstructive Surgery Physician · Palo Alto, CA
• Kirkham Berwick Wood, MD Orthopaedic Surgery Physician · Stanford, CA
• Laurice Tonia Yang, MD Neurology Physician · Stanford, CA

Other providers in Stanford

• Mishu Sharma Chandra, MD

  Individual Epilepsy Physician · NPI 1891291928

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 723-4000

• Joanne Lau, MD

  Individual Epilepsy Physician · NPI 1356960249

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 723-4000

• Zahra Sadat-Hossieny, MD

  Individual Epilepsy Physician · NPI 1063754307

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 723-4000

• Niyatee Pradeep Samudra

  Individual Epilepsy Physician · NPI 1710373360

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 723-4000

• Ann Hyslop Segeren, MD

  Individual Epilepsy Physician · NPI 1447446794

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 723-4000