Althaea Z. Greenstone, MD

Hospitals where Althaea Z. Greenstone works

Medicare's Facility Affiliation Data lists Althaea Z. Greenstone 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 - San FranciscoSan Francisco, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050076

Practice locations

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

• 2200 Ofarrell StSan Francisco, CA 94115 (415) 833‑2000
• 2238 Geary BlvdSan Francisco, CA 94115 (415) 833‑2200
• 2425 Geary BlvdSan Francisco, CA 94115 (415) 833‑2200

Group practices

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

• Permanente Medical Group Inc10,996 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in California →

Other general surgeons in San Francisco

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

• Matthew Y. Lin, MD
• Stephanie J. Maroney, MD
• Shoko E. Abe, MD
• Qimeng Gao, MD
• Shareef M. Syed, MD
• Kevin R. Hiler, MD
• Pooja U. Neiman, MD
• Amanda Sammann, MD

All general surgeons in San Francisco →

Other clinicians in Permanente Medical Group Inc

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

• Lauren B. Raher, MD
• Megan R. Sunga, NP
• Janell L. Aguirre, MD
• Ahmed A. Al-Ghrairi, MD
• Mihir G. Thaker, DO
• Peter J. Kappel, 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. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
5. Medicare Care Compare — official Medicare tool to look up clinicians