Joshua Z. Fan, MD

Medicare activity in 2024

Official CMS public-use data for Joshua Z. Fan, 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)312 services
2. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)310 services
3. Critical care, each additional 30 minutes (99292)225 services
4. Critical care, first 30-74 minutes (99291)131 services
5. Emergency department visit with moderate level of medical decision making (99284)64 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 cholesterol74%
• Arthritis52%
• Diabetes47%
• Chronic kidney disease42%
• Depression37%

Hospitals where Joshua Z. Fan works

Medicare's Facility Affiliation Data lists Joshua Z. Fan 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.

• NorthBay Medical CenterFairfield, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050367

Practice locations

Addresses where Joshua Z. Fan is enrolled with Medicare (CMS data updated October 2, 2026).

• 1000 Nut Tree RdVacaville, CA 95687 (707) 624‑7000
• 1200 B Gale Wilson BlvdFairfield, CA 94533 (707) 429‑3600

Group practices

Medicare enrollment lists Joshua Z. Fan as a member of this group (CMS data updated October 2, 2026).

• NorthBay Physicians Surgery Center, LLC324 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Vacaville

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

• Alana M. Kinrich, MD
• May T. Tun, MD
• Anne M. Walker, MD
• Steven M. Garcia, MD
• Teresa A. Bonzani, MD
• Joseph A. Izzo, MD
• Tiffany R. Lewis, MD
• Douglas Malcolm, MD

All emergency medicine doctors in Vacaville →

Other clinicians in NorthBay Physicians Surgery Center, LLC

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

• Leslie Olson, MD
• Austin W. Vonasek, DPM
• Michelle Sit, MD
• Jessica Alonte, PT
• Jonathan D. Lopez, MD
• Gian L. Pinot, 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