Jon Warren Loo, 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.

• Memorialcare Orange Coast Medical Center Hospital · Fountain Valley, CA · listed as Orange Coast Memorial Medical Center
• Memorialcare Saddleback Medical Center Hospital · Laguna Hills, CA · listed as Saddleback Memorial Medical Center

Colleagues at Memorialcare Medical Foundation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 562 clinicians in the practice; 12 are shown here.

• Amir Abolhoda, MD Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Orange, CA
• Mrs. Jody Noelle Carr, PA-C Physician Assistant · Fountain Valley, CA
• Dr. Angela Maria Colombo, MD Family Medicine Physician · Newport Beach, CA
• Dr. Babak Firoozi, MD Gastroenterology Physician · Fountain Valley, CA
• Rachel Aline Hargrove, MD Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Fountain Valley, CA
• Martha Kataura Registered Dietitian · Fountain Valley, CA
• Dr. James Jong Lee, MD Internal Medicine Physician · Laguna Woods, CA
• Dr. Timothy Mark Lee, MD Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Laguna Hills, CA
• Dr. Lizander Cainap Pandy, DO Family Medicine Physician · San Juan Capistrano, CA
• Kristina Louise Preston, PA-C Physician Assistant · Aliso Viejo, CA
• Christina Rodriguez Ruiz, MD Cardiovascular Disease Physician · Long Beach, CA
• Christopher Yee, MD Pulmonary Disease Physician · Long Beach, CA

Other providers in Laguna Hills

• Eugene Huo, MD

  Individual Vascular & Interventional Radiology Physician · NPI 1972769974

  24451 Health Center Dr, Laguna Hills, CA 92653-3689 · (949) 837-4500

• Orange County Urology Associates, Inc a Medical Group

  Organization Vascular & Interventional Radiology Physician · NPI 1215992748

  23961 Calle De La Magdalena Ste 500, Laguna Hills, CA 92653-7622 · (949) 855-1101