Dr. John James Hollowed Jr., 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.

• Cedars-Sinai Medical Center Hospital · Los Angeles, CA
• Ronald Reagan Ucla Medical Center Hospital · Los Angeles, CA
• Santa Monica - Ucla Med Ctr & Orthopaedic Hospital Hospital · Santa Monica, CA

Colleagues at The Regents of the University of California

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1414 clinicians in the practice; 12 are shown here.

• Adam Frank Cavallero, MD Internal Medicine Physician · Los Angeles, CA
• Mindy J Goh, DO Family Medicine Physician · Torrance, CA
• Mark Hall Student in an Organized Health Care Education/Training Program · Westlake Village, CA
• Elizabeth Sun Kim, NP Acute Care Nurse Practitioner · Los Angeles, CA
• Anna Melkonyan, DO Internal Medicine Physician · Valencia, CA
• Dr. Maryum Merchant, MD Internal Medicine Physician · Westlake Village, CA
• Daniel Hock Puneky, MD Hospitalist Physician · Beverly Hills, CA
• Kamalpreet Saini, NP Primary Care Nurse Practitioner · Los Angeles, CA
• Dr. Kamran Shamsa, MD Cardiovascular Disease Physician · Los Angeles, CA
• Dr. Steven Tan, MD Internal Medicine Physician · Los Angeles, CA
• John Matthew Timmerman, MD Hematology & Oncology Physician · Los Angeles, CA
• Dr. Deborah Jean Lee Wong, MD, PHD Hematology & Oncology Physician · Los Angeles, CA

Other providers in Laguna Hills

• Amarpal Chana, MD

  Individual Interventional Cardiology Physician · NPI 1669763447

  24022 Calle De La Plata Ste 500, Laguna Hills, CA 92653-3626 · (714) 445-0228

• Coastal Cardiovascular Institute, Inc

  Organization Interventional Cardiology Physician · NPI 1982005195

  25301 Cabot Rd Ste 104, Laguna Hills, CA 92653-5511 · (949) 499-8080

• Margaret Leila Rasouli MD Inc

  Organization Interventional Cardiology Physician · NPI 1699009258

  24411 Health Center Dr Ste 650, Laguna Hills, CA 92653-3651 · (949) 600-7228

• Dr. Hohai Truong Van, MD

  Individual Interventional Cardiology Physician · NPI 1780761965

  24022 Calle De La Plata Ste 500, Laguna Hills, CA 92653-3107 · (714) 445-0220