Gabriel N. Guzman, MD

Medicare activity in 2024

Official CMS public-use data for Gabriel N. Guzman, 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 50 minutes (99233)156 services
2. Critical care, first 30-74 minutes (99291)156 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)92 services
4. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)29 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%
• Chronic kidney disease57%
• Heart failure51%
• COPD50%
• Atrial fibrillation50%

Hospitals where Gabriel N. Guzman works

Medicare's Facility Affiliation Data lists Gabriel N. Guzman 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

Practice locations

Addresses where Gabriel N. Guzman is enrolled with Medicare (CMS data updated October 2, 2026).

• 2700 Ygnacio Valley Rd, Suite 100Walnut Creek, CA 94598 (925) 939‑3050

Group practices

Medicare enrollment lists Gabriel N. Guzman as a member of this group (CMS data updated October 2, 2026).

• Muir Pulmonary Critical Care13 clinicians in the group

Specialties

• Pulmonary Diseaseprimary
• Critical Care (Intensivists)also

Find other Pulmonary Disease doctors in California →

Other pulmonologists in Walnut Creek

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

• Matthew I. Lyons, MD
• Aamir A. Faruqui, MD
• Vladimir Glinskii, MD
• Nick S. Pakzad, MD
• George Juan
• Jigar N. Patel, MD
• Mark Slootsky, MD
• Ramin Khashayar, MD

All pulmonologists in Walnut Creek →

Other clinicians in Muir Pulmonary Critical Care

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

• Matthew I. Lyons, MD
• Mark Slootsky, MD
• Vala Berjis, MD
• Maryam Amini, MD
• Jigar N. Patel, MD
• George Juan

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