Sean P. Martin, MD

Medicare activity in 2024

Official CMS public-use data for Sean P. Martin, 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)147 services
2. Critical care, first 30-74 minutes (99291)64 services
3. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)53 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%
• Arthritis55%
• Depression38%
• Chronic kidney disease37%
• Diabetes33%

Hospitals where Sean P. Martin works

Medicare's Facility Affiliation Data lists Sean P. Martin 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.

• 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
• 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 Sean P. Martin is enrolled with Medicare (CMS data updated October 2, 2026).

• 1505 Saint Alphonsus WayAlamo, CA 94507 (925) 932‑6330
• 1601 Ygnacio Vly RdWalnut Creek, CA 94596 (925) 939‑3000
• 2637 Shadelands DrWalnut Creek, CA 94598

Group practices

Medicare enrollment lists Sean P. Martin as a member of these groups (CMS data updated October 2, 2026).

• Bass Medical Group291 clinicians in the group
• John Muir Trauma Physicians Billing Service113 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in California →

Other general surgeons in Alamo

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

• Brian T. Chin, MD
• Michael W. Deboisblanc, MD
• Rock C. Liu, MD
• Rafael F. Diaz Flores, MD
• Mary K. Cardoza, MD
• Peter J. Mazolewski, MD

All general surgeons in Alamo →

Other clinicians in Bass Medical Group

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

• Joseph P. Lee, MD
• Abhay M. Vaidya, MD
• Timothy L. Jang, MD
• Joy Ackles, NP
• Ali Khavari, DPM
• Leena K. Gupta, 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