Margaret Seaver

Medicare activity in 2024

Official CMS public-use data for Margaret Seaver, 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. Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (Q9967)3,400 services
2. Injection, denosumab, 1 mg (J0897)3,180 services
3. Injection, dexamethasone sodium phosphate, 1 mg (J1100)1,040 services
4. Injection, palonosetron hcl, 25 mcg (J2469)690 services
5. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)346 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%
• Arthritis47%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)43%
• Diabetes40%
• Chronic kidney disease38%

Hospitals where Margaret Seaver works

Medicare's Facility Affiliation Data lists Margaret Seaver 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.

• Contra Costa Regional Medical CenterMartinez, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050276
• 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
• Sutter Delta Medical CenterAntioch, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050523

Practice locations

Addresses where Margaret Seaver is enrolled with Medicare (CMS data updated October 2, 2026).

• 4721 Dallas Ranch RdAntioch, CA 94531 (925) 778‑0679

Group practices

Medicare enrollment lists Margaret Seaver as a member of this group (CMS data updated October 2, 2026).

• Epic Care55 clinicians in the group

Specialties

• Hematology/Oncologyprimary

Find other Hematology/Oncology doctors in California →

Other hematologist-oncologists in Antioch

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

• Wilson Tong, MD
• Juraj Kavecansky, MD
• Jiyon Choi, MD
• Pankaj Bahl, MD
• Sukhwant N. Singh, MD
• Jeffrey R. Zweig, MD

All hematologist-oncologists in Antioch →

Other clinicians in Epic Care

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

• Ernest N. Lo, MD
• Vivian Letran, DO
• Shelly Gupta, MD
• Uma G. Swamy, MD
• Jane H. Wardzinska, MD
• Srikanth A. Reddy, 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