Michael Chavarria, 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.

• Providence Mission Hospital Hospital · Mission Viejo, CA · listed as Mission Hospital

Colleagues at Western Anesthesia Medical Associates Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 49 clinicians in the practice; 12 are shown here.

• Daniel John Bebereia, MD Student in an Organized Health Care Education/Training Program · LA Mesa, CA
• Mark Burkhardt, MD Anesthesiology Physician · Mission Viejo, CA
• Daniel Gregory Hancock, MD Anesthesiology Physician · Laguna Beach, CA
• Greta Jo Anesthesiology Physician · Mission Viejo, CA
• Dr. Elle R Kaplan, MD Internal Medicine Physician · Mission Viejo, CA
• Ashvin Anil Mehra, MD Student in an Organized Health Care Education/Training Program · Orange, CA
• Meraj M Mohiuddin, MD Anesthesiology Physician · Phoenix, AZ
• Dustin Everett Singer, MD Anesthesiology Physician · Mission Viejo, CA
• Michelle Takata, MD Anesthesiology Physician · Mission Viejo, CA
• Dr. Andrew Tan, MD Anesthesiology Physician · Orange, CA
• Brant Wilson Anesthesiology Physician · Indianapolis, IN
• Steve Wong, MD Anesthesiology Physician · Mission Viejo, CA

Other providers in Stanford

• Michela Camorcia, MD

  Individual Anesthesiology Physician · NPI 1538458427

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 723-6412

• Ian Richard Carroll, MD

  Individual Anesthesiology Physician · NPI 1922148931

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

• Brendan Carvalho, MD

  Individual Anesthesiology Physician · NPI 1770505133

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

• Dr. Michael Warren Champeau, MD

  Individual Anesthesiology Physician · NPI 1538126099

  300 Pasteur Dr, Stanford, CA 94305-2200 · (650) 725-6102

• Cheryl Rhan Hsin Chen, MD

  Individual Anesthesiology Physician · NPI 1114188018

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

• Erdong Chen, MD

  Individual Anesthesiology Physician · NPI 1275092058

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

• Jeffrey S. Chen, MD

  Individual Anesthesiology Physician · NPI 1366838518

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

• Marianne Chen-Lin Chen, MD

  Individual Anesthesiology Physician · NPI 1992949515

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