Quick answers
- Does Edward J. Zajac accept Medicare assignment?
- Yes. Medicare's clinician data says Edward J. Zajac accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Edward J. Zajac see?
- In 2024, CMS data shows 114 Original Medicare patients and 264 services for Edward J. Zajac. This counts Original Medicare only and measures volume, not quality.
- What is Edward J. Zajac's NPI number?
- 1265406060. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Edward J. Zajac, 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.
| Original Medicare patients | 114 |
|---|---|
| Services billed to Medicare | 264 |
| Different services or procedures | 56 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)45 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)28 services
- Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist (93458)22 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)20 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)18 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 disease59%
- Heart failure46%
- Arthritis45%
- Atrial fibrillation45%
Hospitals where Edward J. Zajac works
Medicare's Facility Affiliation Data lists Edward J. Zajac 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.
- Buena Vista Regional Medical CenterStorm Lake, IA · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 161375
- Horn Memorial HospitalIda Grove, IA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 161354
- Loring HospitalSac City, IA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 161370
- St Lukes Regional Medical CenterSioux City, IA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 160146
- Trinity Regional Medical CenterFort Dodge, IA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 160016
Practice locations
Addresses where Edward J. Zajac is enrolled with Medicare (CMS data updated October 2, 2026).
- 2720 Stone Park BlvdSioux City, IA 51104 (712) 279‑3500
- 5885 Sunnybrook Dr, Suite L200Sioux City, IA 51106 (712) 239‑4702
Group practices
Medicare enrollment lists Edward J. Zajac as a member of these groups (CMS data updated October 2, 2026).
- Northwest Iowa Hospital Corporation160 clinicians in the group
- Ida County Iowa Community Hospital12 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Iowa →
Other cardiologists in Sioux City
Clinicians with the same Medicare primary specialty in Sioux City, IA — not a recommendation.
Other clinicians in Northwest Iowa Hospital Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 1981 (45 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1265406060 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians