Margaret Sarah Helen Ferris, 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.

• MS. Zohra Aziz, PA-C, MMS Physician Assistant · Stanford, CA
• Krista Briana Blaustein, PA-C Physician Assistant · Stanford, CA
• Nathaniel Aidan Blecher, MD Ophthalmology Physician · Palo Alto, CA
• Ashley Shiyuan Chang, PA-C Physician Assistant · Stanford, CA
• Mrs. Alexandra Cummings, PA-C Physician Assistant · Palo Alto, CA
• Yousra Elsir, PA-C Physician Assistant · Stanford, CA
• Anne Elizabeth Goldring, MD Physical Medicine & Rehabilitation Physician · Stanford, CA
• Erika Tiffanie Liao, MD Student in an Organized Health Care Education/Training Program · Stanford, CA
• Sally Salah Hassan Mahmoud, MD Emergency Medicine Physician · Stanford, CA
• Aabed Meer, MD Internal Medicine Physician · Stanford, CA
• Valentina Shakoori Physician Assistant · Stanford, CA
• Jason Ya, MD Dermatology Physician · Stanford, CA

Other providers in Stanford

• John West Day, MD

  Individual Neurology Physician · NPI 1447291992

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

• Leana Marie Doherty, MD

  Individual Neurology Physician · NPI 1851634190

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 497-8000

• Shefali Dujari, MD

  Individual Neurology Physician · NPI 1801242953

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 723-5072

• Erik Richard Ensrud, MD

  Individual Neurology Physician · NPI 1982658738

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

• Daniela Minna Fishbein, MD

  Individual Neurology Physician · NPI 1902487333

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

• Kristin Marissa Galetta, MD

  Individual Neurology Physician · NPI 1952782237

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

• Hideki Garren, MD

  Individual Neurology Physician · NPI 1407807183

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 498-5710

• Paul Matthew George, MD

  Individual Neurology Physician · NPI 1245487941

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