Vivian H. Diep, MD

Medicare activity in 2024

Official CMS public-use data for Vivian H. Diep, 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. Emergency department visit with high level of medical decision making (99285)156 services
2. Emergency department visit with moderate level of medical decision making (99284)32 services
3. Critical care, first 30-74 minutes (99291)15 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%
• Arthritis61%
• Diabetes58%
• Ischemic heart disease48%
• Heart failure47%

Hospitals where Vivian H. Diep works

Medicare's Facility Affiliation Data lists Vivian H. Diep 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.

• MacNeal HospitalBerwyn, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140054
• UChicago Medicine AdventHealth BolingbrookBolingbrook, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140304
• UChicago Medicine AdventHealth HinsdaleHinsdale, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140122
• UChicago Medicine AdventHealth La GrangeLa Grange, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140065
• West Suburban Medical CenterOak Park, IL · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: not listed by Medicare · CCN 140049

Practice locations

Addresses where Vivian H. Diep is enrolled with Medicare (CMS data updated October 2, 2026).

• 3249 Oak Park AveBerwyn, IL 60402 (708) 783‑9100

Group practices

Medicare enrollment lists Vivian H. Diep as a member of this group (CMS data updated October 2, 2026).

• Cepamerica Illinois LLP499 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in Illinois →

Other emergency medicine doctors in Berwyn

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

• Monique Arvisais-Anhalt, MD
• Stefanie Herfurth, DO
• Neesha Patel, MD
• Young Suh, MD
• Francis R. Villanueva, DO
• Elizabeth Ortiz, MD
• Nihal P. Varkey, MD
• Julie J. Patel, MD

All emergency medicine doctors in Berwyn →

Other clinicians in Cepamerica Illinois LLP

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

• Nathan K. Brinker, DO
• Shu B. Chan, MD
• Lizabeth S. Rantissi
• Niccole A. Bart, MD
• Maher K. Ahmad, MD
• Ashray Ohri, 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