Courtnay W. Bloomer, MD

Medicare activity in 2024

Official CMS public-use data for Courtnay W. Bloomer, 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, gadobutrol, 0.1 ml (A9585)2,750 services
2. X-ray of chest, 1 view (71045)1,031 services
3. Ct scan head or brain without contrast (70450)584 services
4. Mri scan of brain without contrast (70551)400 services
5. Ct scan of blood vessels of head with contrast (70496)268 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%
• Arthritis49%
• Diabetes43%
• Chronic kidney disease40%
• Ischemic heart disease35%

Hospitals where Courtnay W. Bloomer works

Medicare's Facility Affiliation Data lists Courtnay W. Bloomer 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
• Good Samaritan HospitalSan Jose, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050380
• John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050496
• John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050180
• Santa Clara Valley Medical CenterSan Jose, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050038

Practice locations

Addresses where Courtnay W. Bloomer is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 15; the Medicare profile lists all.

• 1000 Nut Tree RdVacaville, CA 95687 (707) 624‑7000
• 1002 Nut Tree RdVacaville, CA 95687 (925) 296‑7150
• 15 Bay Forest DrOakland, CA 94611 (925) 296‑7150
• 1601 Ygnacio Valley RdWalnut Creek, CA 94598 (925) 295‑1545
• 1601 Ygnacio Vly RdWalnut Creek, CA 94596 (925) 939‑3000

Group practices

Medicare enrollment lists Courtnay W. Bloomer as a member of these groups (CMS data updated October 2, 2026).

• County of Santa Clara1,022 clinicians in the group
• Bay Imaging Consultants Medical Group Inc146 clinicians in the group
• John Muir Trauma Physicians Billing Service113 clinicians in the group
• John Muir Magnetic Imaging Center57 clinicians in the group
• Magnetic Imaging Affiliates LLC45 clinicians in the group

Specialties

• Diagnostic Radiologyprimary

Find other Diagnostic Radiology doctors in California →

Other radiologists in Vacaville

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

• George Chu, MD
• Marzban Rad
• Tom Whang, MD
• Michael H. Nguyen, MD
• Michael Cody, MD
• Eddy Q. Pho, MD
• Jaysheel J. Mehta, MD
• Alice B. Smith, MD

All radiologists in Vacaville →

Other clinicians in County of Santa Clara

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

• Brandt C. Mohr, MD
• Belal I. Hakim, MD
• Rashmi Batra, MD
• Alice T. Chuang, MD
• Jiann-Gang F. Luo, MD
• Christopher S. Choo, 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