Nader S. Shihabi, MD

Medicare activity in 2024

Official CMS public-use data for Nader S. Shihabi, 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. Pathology examination of tissue using a microscope, intermediate complexity (88305)3,905 services
2. Special stained specimen slides to examine tissue, each additional procedure (88341)888 services
3. Special stained specimen slides to examine tissue, initial procedure (88342)571 services
4. Screening cytopathology, cervical or vaginal (any reporting system), collected in preservative fluid, automated thin layer preparation, with screening by automated system, under physician supervision (G0144)337 services
5. Cell examination of specimen, selective cellular enhancement technique (88112)315 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 pressure68%
• Arthritis43%
• Diabetes26%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)26%
• Anxiety23%

Hospitals where Nader S. Shihabi works

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

• 1601 Ygnacio Valley Rd, Suite 201Walnut Creek, CA 94598 (925) 939‑3000
• 2540 E StConcord, CA 94520 (925) 682‑8200
• 399 Taylor Blvd, Suite 200Pleasant Hill, CA 94523 (925) 270‑3575

Group practices

Medicare enrollment lists Nader S. Shihabi as a member of this group (CMS data updated October 2, 2026).

• Contra Costa Pathology Associates7 clinicians in the group

Specialties

• Pathologyprimary

Find other Pathology doctors in California →

Other pathologists in Walnut Creek

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

• Nicholas Byrne, MD
• Emily A. Green, MD
• Ji Lu, MD
• Gregory J. Rumore, MD
• Dennis Hwang, MD
• David Zlotnick, MD
• Gregg W. Manson, MD
• Jody B. Burkes, MD

All pathologists in Walnut Creek →

Other clinicians in Contra Costa Pathology Associates

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

• Nicholas Byrne, MD
• Rebecca E. Spies, MD
• Risha Ramdall, MD
• Dennis Hwang, MD
• David Zlotnick, 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