Chang Hwa Mary Chen, MD

Medicare activity in 2024

Official CMS public-use data for Chang Hwa Mary Chen, 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. Insertion of artery tube for blood sampling or infusion through skin (36620)31 services
2. Anesthesia for procedure for total knee joint replacement (01402)30 services
3. Anesthesia for other procedure on upper abdomen (00790)18 services
4. Anesthesia for extensive surgery on spine (00670)17 services
5. Anesthesia for total hip replacement (01214)16 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%
• Arthritis67%
• Ischemic heart disease41%
• Anxiety37%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)29%

Hospitals where Chang Hwa Mary Chen works

Medicare's Facility Affiliation Data lists Chang Hwa Mary Chen 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.

• Saint John's Health CenterSanta Monica, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050290

Practice locations

Addresses where Chang Hwa Mary Chen is enrolled with Medicare (CMS data updated October 2, 2026).

• 1328 22nd St, St Johns HospitalSanta Monica, CA 90404 (310) 477‑2465

Group practices

Medicare enrollment lists Chang Hwa Mary Chen as a member of this group (CMS data updated October 2, 2026).

• Bayside Anesthesia Medical Group46 clinicians in the group

Specialties

• Anesthesiologyprimary
• Interventional Pain Managementalso

Find other Anesthesiology doctors in California →

Other anesthesiologists in Santa Monica

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

• Ehab A. Bahrun, MD
• Jacqueline C. Drummond-Lewis, MD
• Benjamin D. Rosellini, MD
• Glenn I. Powers, MD
• Kasra Sarabakhsh, MD
• Ryan K. Gole, MD
• Robert A. Whittington, MD
• Daniel L. Cherkassky, MD

All anesthesiologists in Santa Monica →

Other clinicians in Bayside Anesthesia Medical Group

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

• Jacqueline C. Drummond-Lewis, MD
• Kevin M. Miller, MD
• Kasra Sarabakhsh, MD
• Ryan K. Gole, MD
• Daniel L. Cherkassky, MD
• Warren W. Thio, MD

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