Piyush Aggarwal, MD

Medicare activity in 2024

Official CMS public-use data for Piyush Aggarwal, 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 moderate level of decision making, if using time, 30 minutes or more (99214)102 services
2. Diagnostic exam of anus using an endoscope (46600)73 services
3. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)58 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)45 services
5. Removal of external hemorrhoids by rubber banding (46221)30 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 cholesterol73%
• High blood pressure70%
• Arthritis51%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)36%
• Diabetes28%
• Anxiety26%

Hospitals where Piyush Aggarwal works

Medicare's Facility Affiliation Data lists Piyush Aggarwal 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 Piyush Aggarwal is enrolled with Medicare (CMS data updated October 2, 2026).

• 1479 Ygnacio Valley Rd, Suite 200Walnut Creek, CA 94598 (925) 296‑7340

Group practices

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

• John Muir Physician Network494 clinicians in the group

Specialties

• Colorectal Surgery (Proctology)primary

Find other Colorectal Surgery (Proctology) doctors in California →

Other colorectal surgeons in California

Clinicians with the same Medicare primary specialty in California — not a recommendation.

• Salvador G. Guevara, MD
• Blake M. Read, MD
• Bassem Ghobrial, MD
• Skandan Shanmugan, MD
• Ravin R. Kumar, MD
• Dhruvil P. Gandhi, MD
• Andreas M. Kaiser, MD
• David Rodriguez, MD

All colorectal surgeons in California →

Other clinicians in John Muir Physician Network

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

• Michael Kats, MD
• Thuthuy T. Phamle, MD
• Randall Joseph P. Poblete, PA
• Nida Fatima, DO
• Walter T. Savage, MD
• Irene J. Ventura-Zadran

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