Joseph Y. Mardanzai, MD

Medicare activity in 2024

Official CMS public-use data for Joseph Y. Mardanzai, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)17 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%
• Ischemic heart disease63%
• Arthritis47%
• Heart failure39%
• Chronic kidney disease37%

Hospitals where Joseph Y. Mardanzai works

Medicare's Facility Affiliation Data lists Joseph Y. Mardanzai 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.

• Adventist Health Sierra VistaSan Luis Obispo, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050506
• Adventist Health Twin CitiesTempleton, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050633
• San Ramon Regional Medical CenterSan Ramon, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050689

Practice locations

Addresses where Joseph Y. Mardanzai is enrolled with Medicare (CMS data updated October 2, 2026).

• 1010 Murray AveSan Luis Obispo, CA 93405 (805) 546‑7600
• 1100 Las Tablas RdTempleton, CA 93465 (805) 434‑3500
• 6001 Norris Canyon RdSan Ramon, CA 94583 (925) 275‑9200

Group practices

Medicare enrollment lists Joseph Y. Mardanzai as a member of these groups (CMS data updated October 2, 2026).

• Galen Inpatient Physicians PC1,077 clinicians in the group
• Quantum Healthcare Medical Associates Inc109 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in San Luis Obispo

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

• Sowmya Oza, MD
• Damon J. McEnroe, MD
• Olga Grigorieva-Olson, MD
• Michael J. Dibiase, MD
• Luke G. Moselle
• Brian S. Penton, MD
• Cindy H. Su, MD
• Deborah A. Cherry, MD

All internal medicine doctors in San Luis Obispo →

Other clinicians in Galen Inpatient Physicians PC

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

• Vuppala V. Reddy, MD
• Ripjit Singh, MD
• Arvind K. Ravinutala, MD
• Mohamed Elkomy, MD
• Danica Milenkovich, MD
• Jatin Chhabra, 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