Ji Won Ahn, 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.

Colleagues at Permanente Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 10941 clinicians in the practice; 12 are shown here.

• Alexandra Marie Demarco Student in an Organized Health Care Education/Training Program · Fremont, CA
• Nicole Dietze, ASW Social Worker · Vallejo, CA
• Vira Fomenko, MD Family Medicine Physician · San Jose, CA
• Wenchang Guo Anatomic Pathology & Clinical Pathology Physician · Fresno, CA
• Ryan Balacanao Huerto, MD Family Medicine Physician · Ypsilanti, MI
• Yuri Ito, DO Student in an Organized Health Care Education/Training Program · Modesto, CA
• Miss. Olivia Yu-Ping Lai, MD Dermatology Physician · Pleasanton, CA
• Mario Mangiardi, MD Neurology Physician · Petaluma, CA
• Kevin Dipondo Ouma, MD Infectious Disease Physician · Fresno, CA
• Bahman Sotoodian, MD, FRCPC, FAAD Dermatology Physician · Salt Lake City, UT
• Dr. Dean Thorsen Anesthesiology Physician · San Francisco, CA
• Fatemeh Yousefi, DO Student in an Organized Health Care Education/Training Program · Sacramento, CA

Other providers in Walnut Creek

• Dr. Stefanie Altmann, DO

  Individual MOHS-Micrographic Surgery Physician · NPI 1912494188

  100 Pringle Ave Ste 425, Walnut Creek, CA 94596-7385 · (925) 932-3800

• Hovik Ashchyan, MD

  Individual MOHS-Micrographic Surgery Physician · NPI 1710477088

  355 Lennon Ln Ste 255, Walnut Creek, CA 94598-2496 · (925) 357-9785

• Mrs. Heather Marie Nudo, PA

  Individual MOHS-Micrographic Surgery Physician · NPI 1518077411

  110 Tampico Ste 200, Walnut Creek, CA 94598-2998 · (925) 838-4900

• Kathleen M. Ting, MD

  Individual MOHS-Micrographic Surgery Physician · NPI 1407934599

  320 Lennon Ln, Walnut Creek, CA 94598-2419 · (925) 906-2000