James Mastriana, MD

Medicare activity in 2024

Official CMS public-use data for James Mastriana, 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. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)70 services
2. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)48 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)41 services
4. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)26 services
5. X-ray of chest, 2 views (71046)21 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 cholesterol75%
• High blood pressure74%
• Arthritis45%
• Anxiety30%
• Ischemic heart disease25%
• Depression25%

Hospitals where James Mastriana works

Medicare's Facility Affiliation Data lists James Mastriana 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-Santa ClaraSanta Clara, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050071

Practice locations

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

• 700 Lawrence ExpySanta Clara, CA 95051 (408) 851‑1000

Group practices

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

• Permanente Medical Group Inc10,996 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Santa Clara

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

• Jennifer J. Shangkuan, MD
• Sean M. Curry, MD
• Rwo-Wen Huang, MD
• Emily J. Siegel, MD
• Brian H. Cheung, MD
• Gurpreet Kaur, DO
• August R. Grace, MD
• Carrie A. Pinchbeck, MD

All emergency medicine doctors in Santa Clara →

Other clinicians in Permanente Medical Group Inc

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

• Mathew E. Kurowski, PA
• Pamela M. Valentine, MD
• Violeta Gutierrez Sherman, MD
• Barnabas Yik, MD
• Cosette C. Kasanza, NP
• Timothy J. Rupp, 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