Zachary Killeen, MD

Medicare activity in 2024

Official CMS public-use data for Zachary Killeen, 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)82 services
2. Emergency department visit with moderate level of medical decision making (99284)60 services
3. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)40 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 cholesterol74%
• Arthritis48%
• Diabetes43%
• Anxiety30%
• Chronic kidney disease30%

Hospitals where Zachary Killeen works

Medicare's Facility Affiliation Data lists Zachary Killeen 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.

• Dignity Health - Arizona General HospitalLaveen, AZ · Acute Care Hospital · Emergency services: not listed by Medicare · CCN 030136

Practice locations

Addresses where Zachary Killeen is enrolled with Medicare (CMS data updated October 2, 2026).

• 7171 S 51st AveLaveen, AZ 85339 (888) 732‑3317

Group practices

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

• Tec Emergency Physicians of Arizona, LLC153 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in Arizona →

Other emergency medicine doctors in Laveen

Clinicians with the same Medicare primary specialty in Laveen, AZ — not a recommendation.

• Mark Crosby, DO
• Charles M. Smith, MD
• Jared L. Taylor, DO
• Ryan S. Southworth, DO
• Daniel Oscislawski, MD
• Scott A. Kirby, DO
• Raymond J. Hemmert, DO
• Justin N. Dzik, MD

All emergency medicine doctors in Laveen →

Other clinicians in Tec Emergency Physicians of Arizona, LLC

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

• Brad V. Harrison, MD
• Jimmy Nguyen, DO
• Shane M. Elton, DO
• Richard Peterson, DO
• Francisco J. Andrade Jr, MD
• Hillary P. Seematter, 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