Chad J. Zack, MD

Medicare activity in 2024

Official CMS public-use data for Chad J. Zack, 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. Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)108 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)87 services
3. Ultrasound evaluation of heart blood vessel or graft with review by radiologist, initial vessel (92978)44 services
4. Insertion of stents with balloon dilation of coronary artery or branch, single artery or branch (92928)36 services
5. Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist (93458)31 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%
• Ischemic heart disease75%
• Arthritis52%
• Heart failure51%
• Diabetes49%

Hospitals where Chad J. Zack works

Medicare's Facility Affiliation Data lists Chad J. Zack 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.

• Milton S Hershey Medical CenterHershey, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390256
• Penn State Health St. JosephReading, PA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 390096

Practice locations

Addresses where Chad J. Zack is enrolled with Medicare (CMS data updated October 2, 2026).

• 500 Universidy DrHershey, PA 17033 (717) 531‑8427

Group practices

Medicare enrollment lists Chad J. Zack as a member of this group (CMS data updated October 2, 2026).

• The Milton S Hershey Medical Center Physicians Group1,623 clinicians in the group

Specialties

• Interventional Cardiologyprimary
• Cardiovascular Disease (Cardiology)also

Find other Interventional Cardiology doctors in Pennsylvania →

Other interventional cardiologists in Hershey

Clinicians with the same Medicare primary specialty in Hershey, PA — not a recommendation.

• Mark Kozak, MD
• Maulin J. Patel, DO
• Steven M. Ettinger, MD

All interventional cardiologists in Hershey →

Other clinicians in The Milton S Hershey Medical Center Physicians Group

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

• Katherine D. Pavlos, PA
• Justin W. Walker, MD
• Kristen Foering, MD
• Lawrence M. Knab, MD
• Jill S. McClelland, AU
• Abigail L. Snyder, PA

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