Warren J. Gasper, MD

Medicare activity in 2024

Official CMS public-use data for Warren J. Gasper, 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. Complete ultrasound study of arm and leg arteries (93923)216 services
2. Ultrasound of leg arteries or artery grafts (93925)163 services
3. Ultrasound study of arm or leg veins with compression and maneuvers (93970)59 services
4. Ultrasound of one leg arteries or artery grafts (93926)54 services
5. Ultrasound of both sides of head and neck blood flow (93880)48 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 disease50%
• Ischemic heart disease49%
• Arthritis47%
• Diabetes42%

Hospitals where Warren J. Gasper works

Medicare's Facility Affiliation Data lists Warren J. Gasper 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.

• UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050454

Practice locations

Addresses where Warren J. Gasper is enrolled with Medicare (CMS data updated October 2, 2026).

• 400 Pamassus AveSan Francisco, CA 94143 (415) 476‑1316
• 400 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000

Group practices

Medicare enrollment lists Warren J. Gasper as a member of these groups (CMS data updated October 2, 2026).

• UCSF Medical Group Business Services1,598 clinicians in the group
• UCSF Dept of Surgery215 clinicians in the group

Specialties

• Vascular Surgeryprimary

Find other Vascular Surgery doctors in California →

Other vascular surgeons in San Francisco

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

• Allan M. Conway, MD
• Susan A. Bailey, MD
• Marc A. Levine, MD
• James C. Iannuzzi, MD
• Stephanie Lin, MD
• Eugene C. Groeger, MD
• Adam Z. Oskowitz, MD
• Shant M. Vartanian, MD

All vascular surgeons in San Francisco →

Other clinicians in UCSF Medical Group Business Services

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

• Donald T. Kephart, MD
• Akash Virupakshaiah, MD
• Christine Blauvelt, MD
• O'Rese Knight, MD
• Greer Waldrop, MD
• Allyson Richardson, 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