Maria Norma Villalon Landeros, MD

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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. Those with a page here are linked.

• Stanford Health Care Hospital · Stanford, CA
• Stanford Health Care Tri-Valley Hospital · Pleasanton, CA
• Centerwell Asian American Home Health Home health agency · Alameda, 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. Debra E Boland Registered Nurse · Stanford, CA
• Bertan Deniz Cakir, MD Ophthalmology Physician · Stanford, CA
• Joo Young Kim, PA-C Surgical Physician Assistant · Stanford, CA
• Edward William Lannon, PHD Psychologist · Stanford, CA
• Carla Marie Pugh, MD Surgery Physician · Palo Alto, CA
• Myleen Dumagan Romarate, NP Acute Care Nurse Practitioner · Palo Alto, CA
• Varsha Sivagami Sathappan, MD Internal Medicine Physician · Palo Alto, CA
• Yon Kyung Sung, MD Internal Medicine Physician · Stanford, CA
• Mytilee Vemuri, MD Psychiatry Physician · Stanford, CA
• Chad Share Weldy, MD Internal Medicine Physician · Stanford, CA
• Bill Nam Wong, MD Internal Medicine Physician · Pleasanton, CA
• May Yang, MD Anesthesiology Physician · Stanford, CA

Other providers in Stanford

• Dr. David Hinton Thom, MD

  Individual Family Medicine Physician · NPI 1164447736

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 723-2325

• Elise C Torres, MD

  Individual Family Medicine Physician · NPI 1093045700

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

• Timothy Tsai, DO

  Individual Family Medicine Physician · NPI 1447785704

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

• Crystal Unzueta, MD

  Individual Family Medicine Physician · NPI 1538574470

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

• Eva Elisabeth Weinlander, MD

  Individual Family Medicine Physician · NPI 1164564217

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

• Lydia Ann Wong, MD

  Individual Family Medicine Physician · NPI 1356672398

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

• Dr. Maria Harsha Wusu, MD, MSED

  Individual Family Medicine Physician · NPI 1760828891

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

• Yuan Zhang, MD

  Individual Family Medicine Physician · NPI 1609571868

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