Katherine M. Tsai, MD

Medicare activity in 2024

Official CMS public-use data for Katherine M. Tsai, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)30 services
2. Anesthesia for other procedure on top of arm bone and shoulder joint (01630)29 services
3. Anesthesia for other procedure or exam of knee joint using an endoscope (01400)22 services
4. Anesthesia for injection, drainage or aspiration procedures on spine or spinal cord of lower back accessed through skin using imaging guidance (01938)11 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Arthritis69%
• Diabetes31%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)25%
• Chronic kidney disease24%

Hospitals where Katherine M. Tsai works

Medicare's Facility Affiliation Data lists Katherine M. Tsai at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Kaiser Foundation Hospital - DowneyDowney, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 050139

Practice locations

Addresses where Katherine M. Tsai is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.

• 3445 Pacific Coast HwyTorrance, CA 90505
• 6041 Cadillac AveLos Angeles, CA 90034 (800) 954‑8000
• 9333 Imperial HwyDowney, CA 90242 (800) 923‑4040
• 9333 Rosecrans AveBellflower, CA 90706 (562) 461‑3000
• 9353 Imperial HwyDowney, CA 90242 (562) 657‑9000

Group practices

Medicare enrollment lists Katherine M. Tsai as a member of these groups (CMS data updated October 2, 2026).

• Southern California Permanente Medical Group11,293 clinicians in the group
• Perioperative Anesthesia Consultants8 clinicians in the group

Specialties

• Anesthesiologyprimary

Find other Anesthesiology doctors in California →

Other anesthesiologists in Torrance

Clinicians with the same Medicare primary specialty in Torrance, CA — not a recommendation.

• Hoss Mir Sadeghi, MD
• Victor Wong, MD
• Anthony Arellano Kruse, MD
• Sean H. Tretiak, MD
• Nicholas J. Mondek, MD
• Derek Kono, DO
• Mitchell K. Taguchi, MD
• Patrick J. Donley, MD

All anesthesiologists in Torrance →

Other clinicians in Southern California Permanente Medical Group

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Michelle S. Ghostine, MD
• Aqueelah H. Richmond, MD
• Jose T. Rodriguez, PA
• Freddie M. Ibrahim, MD
• Rana Rofagha Sajjadian, MD
• Betty H. Nguyen, DO

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians