James A. Hirshberg, MD

Medicare activity in 2024

Official CMS public-use data for James A. Hirshberg, 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. Emergency department visit with high level of medical decision making (99285)133 services
2. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)124 services
3. Emergency department visit with moderate level of medical decision making (99284)82 services
4. Critical care, first 30-74 minutes (99291)70 services
5. Electrocardiogram (ecg) 1 to 3 leads with review by physician only (93042)36 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 pressure72%
• High cholesterol63%
• Arthritis38%
• Diabetes37%
• Chronic kidney disease36%
• Depression34%

Hospitals where James A. Hirshberg works

Medicare's Facility Affiliation Data lists James A. Hirshberg 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.

• Alta Bates Summit Medical CenterOakland, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050043
• Alta Bates Summit Medical Center - Alta Bates CampBerkeley, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050305

Practice locations

Addresses where James A. Hirshberg is enrolled with Medicare (CMS data updated October 2, 2026).

• 2450 Ashby AveBerkeley, CA 94705 (510) 204‑4444
• 3200 Kearney StFremont, CA 94538 (510) 490‑1222
• 350 Hawthorne AveOakland, CA 94609 (510) 655‑4000

Group practices

Medicare enrollment lists James A. Hirshberg as a member of these groups (CMS data updated October 2, 2026).

• Sutter Bay Medical Foundation3,829 clinicians in the group
• Berkeley Emergency Medical Group Inc41 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Berkeley

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

• Marcus L. Williams, MD
• Emily M. Sze, MD
• Jonathan R. Cedermaz, MD
• Zachary D. Grunwald, MD
• Steven M. Sornsin, MD
• Chris Feng, MD
• Keala K. Landry, MD
• Hyacinth De Guzman, MD

All emergency medicine doctors in Berkeley →

Other clinicians in Sutter Bay Medical Foundation

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

• Ryan Brandt, MD
• Brittney S. Berkey, PA
• Brittney M. Powers, NP
• Shirley Chi, MD
• Megan L. Yanik, MD
• Matthew Siri, 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