EDWARD J ZAJAC MD
NPI 1265406060
Internal Medicine - Interventional Cardiology in Sioux City, IA
About Edward J Zajac Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
EDWARD J ZAJAC MD (NPI 1265406060) is an individual interventional cardiology provider in Sioux City, Iowa, licensed in Iowa (32426) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS, is affiliated with Trinity Regional Medical Center, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (1981).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Edward J Zajac Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Edward Zajac reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Sioux City, IA 51104
- Reassigned Medicare billing, Iowa enrollment
- 281 clinicians in this Medicare group
Ida Grove, IA 51445
- Reassigned Medicare billing, Iowa enrollment
- 39 clinicians in this Medicare group
Hartley, IA 51346
- Reassigned Medicare billing, Iowa enrollment
- 176 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Trinity Regional Medical Center
Acute Care Hospitals · Fort Dodge, IASt Lukes Regional Medical Center
Acute Care Hospitals · Sioux City, IAHorn Memorial Hospital
Critical Access Hospitals · Ida Grove, IALoring Hospital
Critical Access Hospitals · Sac City, IABuena Vista Regional Medical Center
Critical Access Hospitals · Storm Lake, IAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 51106 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SIOUX CITY, IA 51106
SIOUX CITY, IA 51106
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Edward Zajac's NPI number?
The NPI number for Edward Zajac is 1265406060. It was assigned to this individual provider in the NPPES registry on February 16, 2006.
Where is Edward Zajac located?
Edward Zajac practices at 5885 Sunnybrook Dr Suite L-200, Sioux City, IA 51106. The listed phone number is (712) 239-4702.
What is Edward Zajac's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Interventional Cardiology, with taxonomy code 207RI0011X.
Is Edward Zajac enrolled in Medicare?
Yes. Edward Zajac is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Edward Zajac's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Edward Zajac reassigns Medicare benefits to 3 organizations: Northwest Iowa Hospital Corporation (Sioux City, IA), Ida County Iowa Community Hospital (Ida Grove, IA) and Spencer Municipal Hospital (Hartley, IA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Edward Zajac's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Edward Zajac accept?
Health plans from Oscar Insurance Company, Sanford Health Plan and Wellmark Health Plan of Iowa, Inc. list Edward Zajac as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Edward Zajac affiliated with any hospitals?
According to CMS data, Edward Zajac is affiliated with Trinity Regional Medical Center, St Lukes Regional Medical Center, Horn Memorial Hospital, Loring Hospital and Buena Vista Regional Medical Center.
When was this NPI record last updated?
The NPPES record for Edward Zajac was last updated on October 15, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Edward J Zajac, MD · NPI 1265406060
Interventional Cardiology physician in Sioux City, Iowa. Individual provider, active in the CMS NPPES registry since February 16, 2006.
## Identity
- **NPI:** 1265406060 (Entity type: Individual)
- **Enumerated:** February 16, 2006
- **Primary specialty:** Internal Medicine - Interventional Cardiology · taxonomy 207RI0011X
- **State license:** 32426 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 5885 SUNNYBROOK DR, SUITE L-200, Sioux City, IA 51106-4203
- **Phone:** (712) 239-4702 · **Fax:** (712) 224-5898
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Northwest Iowa Hospital Corporation (NPI 1215962550, Sioux City, IA); Ida County Iowa Community Hospital (NPI 1962635615, Ida Grove, IA); Spencer Municipal Hospital (NPI 1225767338, Hartley, IA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 1981
## Record status
- **NPPES last updated:** October 15, 2015
- **Other identifiers:** Medicare UPIN D13741; Medicare PIN 45234 (IA); Medicaid 0172254 (IA)
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Source: [NPI Profile](https://npiprofile.com/npi/1265406060) · Data from the CMS NPPES public registry.