NPI registry status
Active
2026 NPPES data Cardiovascular Disease Physician NPI 1265406060 MD
Verify on CMS → Edward Zajac, MD
Cardiovascular Disease Physician in Sioux City, Iowa.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 25,298 in Cardiovascular Disease Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
440
Medicare Part D claims · 53 beneficiaries · Cardiovascular Disease Physician avg: 3K
Generic prescribing
70%
generic claims · 30% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$3.0K
20 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Edward Zajac, MD filed 440 Medicare Part D claims in 2024 as a Cardiovascular Disease Physician in Sioux City, Iowa, prescribing 70% generic.
- 440
- Part D claims, 2024
- 70%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥61st
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Edward Zajac, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1265406060), first enumerated 02/16/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 440 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$3.0K in reported industry payments (20 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1265406060 · Cardiovascular Disease Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1265406060
- ENUM-LEGACY 2006
- TAX-MID 25K Cardiovascular Disease
- RX-LIGHT 440
- BOOK-THIN 154 in Iowa
- PHOTO-ENUM Robert Kastner · 2006
Edward Zajac, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
440 ≥ 61st percentile 61% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Edward Zajac, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Edward Zajac, MD?
Quality data not reportedPrimary specialty
Cardiovascular Disease Physician
Medicare Part D claims
440 86% vs specialty avg
Specialty distribution in Iowa
How Cardiovascular Disease Physician compares to other specialties among Iowa providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Cardiovascular Disease Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1265406060 |
|---|---|
| Specialty | Cardiovascular Disease Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 02/16/2006 |
Hospital and facility affiliations
Facilities where Edward Zajac, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Ida County Iowa Community Hospital
Sioux City, IA
Northwest Iowa Hospital Corporation
Sioux City, IA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Edward Zajac, MD. Source: openpaymentsdata.cms.gov.
Total received
$3.0K
Largest payer
Medtronic, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Above average
Edward Zajac, MD - brand share 30.0%
Cardiovascular Disease Physician average
30% brand-name claims vs 70% generic, on 440 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
440
Total Claims
$88K
Total Drug Cost
53
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 641.467
- Total Day Supply
- 19,045
- Brand vs Generic
- 30% brand / 70% generic
- Brand Drug Cost
- $86K
- Generic Drug Cost
- $2K
Patient Demographics
- Average Patient Age
- 71.6 years
- Avg HCC Risk Score
- 1.43
- Gender Split
- 47% female / 53% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Edward Zajac, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
61 claims
- Metoprolol Succinate
Metoprolol Succinate
59 claims
- Clopidogrel
Clopidogrel
49 claims
- Entresto
Entresto
39 claims
- Brilinta 23
Brilinta
23 claims
- Rosuvastatin Calcium 23
Rosuvastatin Calcium
23 claims
- Xarelto 21
Xarelto
21 claims
- Carvedilol 20
Carvedilol
20 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 61 |
| Metoprolol Succinate | 59 |
| Clopidogrel Clopidogrel Bisulfate | 49 |
| Entresto Sacubitril/Valsartan | 39 |
| Brilinta Ticagrelor | 23 |
| Rosuvastatin Calcium | 23 |
| Xarelto Rivaroxaban | 21 |
| Carvedilol | 20 |
| Eliquis Apixaban | 20 |
| Isosorbide Mononitrate Er Isosorbide Mononitrate | 18 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Cardiovascular Disease Physician Overview
How Edward Zajac, MD fits within the Cardiovascular Disease Physician landscape nationally.
25,298
Cardiovascular Disease Physician Providers in US
54
States with Cardiovascular Disease Physician
3,149
Avg Claims per Provider
Edward Zajac, MD's 440 claims are below the specialty average of 3,149.
Nationwide Cardiovascular Disease Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Zajac, both outside Iowa so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Cardiovascular Disease Physician Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Zajac.
One of 154 Cardiovascular Disease Physician providers enrolled in Iowa, 5 are shown here.
Dr. Deepika Reddy Abbadi
M.D
Des Moines, IA
Dr. Mostafa Abohelwa
MD
Iowa City, IA
Dr. Subhi Abu-Halawa
MD
Cedar Rapids, IA
Dr. Shakuntala Advani
M.D.
West Des Moines, IA
Dr. Tauseef Akhtar
MD
Mason City, IA
Compare Cardiovascular Disease Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Edward Zajac, MD's specialty? ▼
Edward Zajac, MD specializes in Cardiovascular Disease Physician and practices in Sioux City, Iowa. Credentials: MD.
How much does Edward Zajac, MD prescribe under Medicare Part D? ▼
In 2024, Edward Zajac, MD wrote 440 Medicare Part D claims totaling $88K in drug costs for 53 beneficiaries.
Where is Edward Zajac, MD located? ▼
Edward Zajac, MD is located at 5885 SUNNYBROOK DR, Sioux City, IA, 51106. Phone: (712) 239-4702.
What is Edward Zajac, MD's NPI number? ▼
Edward Zajac, MD's National Provider Identifier (NPI) is 1265406060, issued on 02/16/2006.
Does Edward Zajac, MD prescribe more brand-name or generic drugs? ▼
Edward Zajac, MD's prescribing is 30% brand-name and 70% generic drugs by claim count, with $86K in brand drug costs.
How many Cardiovascular Disease Physician providers are there in the US? ▼
There are 25,298 Cardiovascular Disease Physician providers across 54 states in the US. The average Cardiovascular Disease Physician provider writes 3,149 Medicare Part D claims per year.
What drugs does Edward Zajac, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Edward Zajac, MD's most frequently prescribed drugs include Atorvastatin Calcium, Metoprolol Succinate, Clopidogrel. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Edward Zajac, MD accept Medicare? ▼
Edward Zajac, MD appears in CMS Medicare data with 440 Part D claims and 53 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Edward Zajac, MD's credentials? ▼
Edward Zajac, MD's NPI is 1265406060 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.