Tim Ken Shen, 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.

• Kaiser Foundation Hospital Fontana/Ontario Hospital · Fontana, CA · listed as Kaiser Foundation Hospitals

Colleagues at Southern California Permanente Medical Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 11242 clinicians in the practice; 12 are shown here.

• Genoveva Aguilar, MD Family Medicine Physician · El Monte, CA
• Amir Besharat, DO Neurology Physician · Seattle, WA
• Angelica Refugio Chavez Social Worker · Los Angeles, CA
• Dr. Matthew M. Enos, OD Optometrist · Fontana, CA
• Wilson Lee, MD Student in an Organized Health Care Education/Training Program · Riverside, CA
• Tiffany S Loftin, MD Physical Medicine & Rehabilitation Physician · Los Angeles, CA
• Justin Allan Mauser, MD Student in an Organized Health Care Education/Training Program · Long Beach, CA
• Kayla Rehm, PA Physician Assistant · Norwalk, CA
• Beatriz Simons, PA Surgical Physician Assistant · Irvine, CA
• Navya Talluri, DO Student in an Organized Health Care Education/Training Program · Harrisburg, PA
• Michelle Stephanie Torres M Mental Health Counselor · Fullerton, CA
• Kaneesha J. Williams, WHNP-BC Ambulatory Women's Health Care Registered Nurse · Los Angeles, CA

Other providers in Fontana

• Bharat V Joshi, MD

  Individual Pulmonary Disease Physician · NPI 1841367752

  9961 Sierra Ave, Fontana, CA 92335-6720 · (909) 427-3910

• Steven Ming-Hann Lee, DO

  Individual Pulmonary Disease Physician · NPI 1912000829

  9961 Sierra Ave, Fontana, CA 92335-6720 · (833) 574-2273

• Dung Anh Nguyen, MD

  Individual Pulmonary Disease Physician · NPI 1215004031

  9961 Sierra Ave, Fontana, CA 92335-6720 · (909) 427-3910

• MS. Karina Pambukhchian, MD

  Individual Pulmonary Disease Physician · NPI 1396995502

  9961 Sierra Ave, Fontana, CA 92335-6720 · (866) 454-3485