Harold Mozwecz, MD

Medicare activity in 2024

Official CMS public-use data for Harold Mozwecz, 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 low level od decision making, if using time, 20 minutes or more (99213)144 services
2. Biopsy of large bowel using a flexible endoscope (45380)68 services
3. Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)55 services
4. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)54 services
5. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)46 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 pressure69%
• Arthritis41%
• Ischemic heart disease26%
• Diabetes23%
• Chronic kidney disease22%

Hospitals where Harold Mozwecz works

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

• 100 Spalding Dr, Suite 208Naperville, IL 60540 (630) 717‑2600

Group practices

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

• Dupage Medical Group Ltd1,322 clinicians in the group

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in Illinois →

Other gastroenterologists in Naperville

Clinicians with the same Medicare primary specialty in Naperville, IL — not a recommendation.

• Rafi M. Ali, MD
• Alan H. Wang, MD
• Gonzalo Pandolfi, MD
• Adam D. Klugman, MD
• Praveen S. Mettu, MD
• Donald C. Hoscheit, MD
• Darren A. Kastin, MD
• Marc A. Fallah, MD

All gastroenterologists in Naperville →

Other clinicians in Dupage Medical Group Ltd

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

• Matthew J. Brandon, MD
• Yong Hui Mai
• Susan S. Kim, MD
• Dipali Patel, PA
• Kevin P. Casey, MD
• Sarah E. Cupp

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