Sigfredo Villarin Ayala Jr.

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.

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.

• Northridge Hospital Medical Center Hospital · Northridge, CA

Colleagues at Northridge Trauma Surgeons Inc a Medical Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 13 clinicians in the practice; 7 are shown here.

• Norair Adjamian, DO Surgery Physician · Northridge, CA
• Mr. Walid S. Arnaout, MD Trauma Surgery Physician · Northridge, CA
• Stephen A Dada, MD Surgery Physician · Wildomar, CA
• Dr. Dantae D. Davies, MD Surgery Physician · Simi Valley, CA
• Marissa Defreese, MD Surgery Physician · Stamford, CT
• Sheliza Kabani Surgical Critical Care Physician · Lees Summit, MO
• Dr. Joseph Anthony Karam, MD Surgery Physician · Northridge, CA

Other providers in Northridge

• Mr. Walid S. Arnaout, MD

  Individual Trauma Surgery Physician · NPI 1023072816

  18250 Roscoe Blvd Ste 220, Northridge, CA 91325-4271 · (818) 280-3901

• Villarin Surgical Services Professional Corporation

  Organization Trauma Surgery Physician · NPI 1487521183

  18300 Roscoe Blvd, Northridge, CA 91325-4105 · (818) 885-8500