Shaham S. Mumtaz, MD

Medicare activity in 2024

Official CMS public-use data for Shaham S. Mumtaz, 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. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)167 services
2. Biopsy of large bowel using a flexible endoscope (45380)140 services
3. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)88 services
4. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)55 services
5. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)53 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 pressure72%
• Arthritis45%
• Diabetes32%
• Ischemic heart disease29%
• Chronic kidney disease28%

Hospitals where Shaham S. Mumtaz works

Medicare's Facility Affiliation Data lists Shaham S. Mumtaz 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.

• Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140242
• Northwestern Medicine Delnor Community HospitalGeneva, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140211

Practice locations

Addresses where Shaham S. Mumtaz is enrolled with Medicare (CMS data updated October 2, 2026).

• 2241 Wankel Way, Suite AOxnard, CA 93030 (805) 983‑0521
• 25 N Winfield RdWinfield, IL 60190 (630) 933‑1600
• 4009 Mission Oaks BlvdCamarillo, CA 93012 (805) 484‑7921

Group practices

Medicare enrollment lists Shaham S. Mumtaz as a member of these groups (CMS data updated October 2, 2026).

• Northwestern Medical Faculty Foundation4,503 clinicians in the group
• Genesis Healthcare Partners PC228 clinicians in the group

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in California →

Other gastroenterologists in Oxnard

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

• Rukmini Enjamuri, MD
• Ashwinee S. Condon, MD
• Justin Marasigan, MD
• Karen L. Simon, MD
• Hardeep M. Singh, MD
• Micha S. Rojany, MD
• Jay J. Guan, MD

All gastroenterologists in Oxnard →

Other clinicians in Northwestern Medical Faculty Foundation

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

• Benjamin L. Wakefield, MD
• Michelle K. Dickinson, MD
• Holly Bajramovic
• Anna B. Shannahan, MD
• Jennifer Scott, OT
• Mark A. Staudacher, 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