Zachary Demertzis, DO
NPI 1225534126 · Clinical Cardiac Electrophysiology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zachary Demertzis, DO is a Clinical Cardiac Electrophysiology Physician provider in Chicago, IL (NPI 1225534126).
Provider details
- NPI number
- 1225534126
- Entity type
- Individual
- Primary specialty
- Clinical Cardiac Electrophysiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 5101026289 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
8 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$406 across 6 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-04-01
- Last updated
- 2025-06-18
- Certified
- 2025-06-18
Frequently asked questions
- What is Zachary Demertzis's NPI number?
- Zachary Demertzis's National Provider Identifier (NPI) is 1225534126, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zachary Demertzis's specialty?
- Zachary Demertzis is listed in the NPPES registry with a primary specialty of Clinical Cardiac Electrophysiology Physician (Allopathic & Osteopathic Physicians).
- Where is Zachary Demertzis located?
- Zachary Demertzis's practice location on file with NPPES is 1620 W Harrison St, Chicago, IL 60612-3801.
- What is Zachary Demertzis's phone number?
- The practice phone number listed in the NPPES registry for Zachary Demertzis is (312) 942-5000.
- Does Zachary Demertzis accept Medicare?
- Zachary Demertzis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zachary Demertzis's NPI active?
- Yes — Zachary Demertzis's NPI (1225534126) is active in the NPPES registry as of the last update on 2025-06-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.