David Koller

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.

• Providence Little Co Of Mary Med Ctr San Pedro Hospital · San Pedro, CA · listed as Providence Little Co of Mary Hospital in San Pedro
• Providence Little Company Of Mary Med Ctr Torrance Hospital · Torrance, CA · listed as Providence Little Company of Mary, Torrance
• Torrance Memorial Medical Center Hospital · Torrance, CA

Colleagues at Cedars-Sinai Medical Care Foundation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1696 clinicians in the practice; 12 are shown here.

• Suzanne Bash, MD Diagnostic Radiology Physician · Los Angeles, CA
• Robbin G Cohen, MD Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Los Angeles, CA
• Dr. Ruthann M Cunningham, MD Emergency Medicine Physician · Beverly Hills, CA
• Nicola D'Attellis, MD Anesthesiology Physician · West Hollywood, CA
• Olivia Bree Greenwald, PA Physician Assistant · Los Angeles, CA
• Ronald S Kingston, MD Nuclear Medicine Physician · Inglewood, CA
• Dr. Evan B Koursh, MD Pediatrics Physician · Beverly Hills, CA
• Elizabeth McGee, NP Acute Care Nurse Practitioner · Los Angeles, CA
• Angela Duyen Nguyen, FNP Registered Nurse · Santa Monica, CA
• Landon Schaffer Polakof, MD Orthopaedic Surgery Physician · Stanford, CA
• Blake Simon, MD Anesthesiology Physician · West Hollywood, CA
• Nirmala Thejomurthy, MD Anesthesiology Physician · West Hollywood, CA

Other providers in Torrance

• Ravin R. Kumar, MD

  Individual Colon & Rectal Surgery Physician · NPI 1194789875

  21840 Normandie Ave Ste 700, Torrance, CA 90502-2047 · (310) 222-5189

• Beverley Petrie, MD

  Individual Colon & Rectal Surgery Physician · NPI 1275544116

  21840 Normandie Ave, Torrance, CA 90502-2047 · (310) 222-5015

• Ravin R Kumar MD, Medical Corporation

  Organization Colon & Rectal Surgery Physician · NPI 1982053278

  3400 Lomita Blvd Ste 200, Torrance, CA 90505-4909 · (310) 539-2630