James Benjamin Chen, MD

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.

• Hoag Memorial Hospital Presbyterian Hospital · Newport Beach, CA
• Hoag Orthopedic Institute Hospital · Irvine, CA · listed as Hoag Orthopedic Institute LLC
• Providence Mission Hospital Hospital · Mission Viejo, CA · listed as Mission Hospital
• N & D Healthcare Services Inc Home health agency · Pasadena, CA · listed as N&d Health Care Services, Inc
• Providence St. Joseph Hospital Hospital · Orange, CA
• Grandcare Home Health Services Home health agency · Pasadena, CA
• Meridian Home Health Home health agency · San Diego, CA
• Providence At Home With Compassus Home Health Orange County Home health agency · Anaheim, CA
• Providence At Home With Compassus Home Health, Orange County South Home health agency · Irvine, CA

Colleagues at Community Orthopedic Medical Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 16 clinicians in the practice; 12 are shown here.

• Michael D Burdi, MD Orthopaedic Surgery Physician · Mission Viejo, CA
• Sydney Alyssa Cohen Physician Assistant · Mission Viejo, CA
• Evan Michael Guerrero, MD Orthopaedic Surgery Physician · Mission Viejo, CA
• Tiva Hanjan, MD Physical Medicine & Rehabilitation Physician · Mission Viejo, CA
• Jason W Knott, PA Surgical Physician Assistant · Mission Viejo, CA
• Jennifer Maholchic, PA-C Physician Assistant · Mission Viejo, CA
• Kent S Marangi, MD Orthopaedic Surgery Physician · Mission Viejo, CA
• John R Morris, MD Orthopaedic Hand Surgery Physician · Mission Viejo, CA
• Charles L Stewart, PA Surgical Physician Assistant · Mission Viejo, CA
• Stephen Leonard Tocci, MD Orthopaedic Surgery Physician · Mission Viejo, CA
• Mr. Tyler Grant Waldron, PA-C Physician Assistant · Mission Viejo, CA
• Neal Washburn, DO Sports Medicine (Physical Medicine & Rehabilitation) Physician · Mission Viejo, CA