Amanda L. Ashton-Sager, MD

Medicare activity in 2024

Official CMS public-use data for Amanda L. Ashton-Sager, 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.

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 pressure71%

Hospitals where Amanda L. Ashton-Sager works

Medicare's Facility Affiliation Data lists Amanda L. Ashton-Sager 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.

• Kaiser Foundation Hospital - AntiochAntioch, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050760
• Kaiser Foundation Hospital - Walnut CreekWalnut Creek, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050072

Practice locations

Addresses where Amanda L. Ashton-Sager is enrolled with Medicare (CMS data updated October 2, 2026).

• 1425 S Main StWalnut Creek, CA 94596 (925) 295‑4000
• 4501 Sand Creek RdAntioch, CA 94531 (925) 813‑6500
• 7300 N Fresno StFresno, CA 93720 (559) 448‑4500
• 901 Nevin AveRichmond, CA 94801 (510) 307‑1500

Group practices

Medicare enrollment lists Amanda L. Ashton-Sager as a member of this group (CMS data updated October 2, 2026).

• Permanente Medical Group Inc10,996 clinicians in the group

Specialties

• Pathologyprimary

Find other Pathology doctors in California →

Other pathologists in Walnut Creek

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

• Qi-Lin D. Cheng, MD
• David Zlotnick, MD
• Armen Khararjian, MD
• Nicholas Byrne, MD
• Jody B. Burkes, MD
• Nupoor Gajjar, MD
• Emily A. Green, MD
• Nader S. Shihabi, MD

All pathologists in Walnut Creek →

Other clinicians in Permanente Medical Group Inc

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

• Olivia Y. Lai, MD
• Saviour Achilike, MD
• Anita Subramanian, MD
• Matthew S. Daniel, DPM
• Wally J. Zarate, MD
• Chi-Na Pak, 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