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ZACHARY DEAN DEMERTZIS DO
NPI 1225534126
Internal Medicine - Clinical Cardiac Electrophysiology in Chicago, IL

Active since April 01, 2018PECOS Enrolled
1620 W HARRISON ST, CHICAGO, IL 60612(312) 942-5000 Get Directions Write a Review

NPPES record last updated: June 18, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Jun 18, 2025, Jul 29, 2021 (2 updates tracked since 2021).

About Zachary Dean Demertzis Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ZACHARY DEAN DEMERTZIS DO (NPI 1225534126) is an individual clinical cardiac electrophysiology provider in Chicago, Illinois, licensed in Illinois (036174746) and active in the NPI registry since April 2018. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1225534126
Entity TypeIndividualMale
Primary Taxonomy207RC0001X
Provider Legal NameZACHARY DEAN DEMERTZISCredential: DO
Location Address1620 W HARRISON STChicago, IL 60612-3801
Mailing Address1620 W Harrison StChicago, IL 60612-3801
Phone(312) 942-5000
Sole ProprietorNo
Enumeration DateApril 1, 2018
Last NPPES UpdateJune 18, 20252 updates tracked since enumeration
NPPES CertifiedJune 18, 2025
✔ NPI 1225534126 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Clinical Cardiac ElectrophysiologyAllopathic & Osteopathic Physicians
Taxonomy Code207RC0001X
License✔ Licensed in IL · 036174746
Definition
A field of special interest within the subspecialty of cardiovascular disease, specialty of Internal Medicine, which involves intricate technical procedures to evaluate heart rhythms and determine appropriate treatment for them.
Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X · License 5101026289 (MI)
1620 W HARRISON ST, Chicago, IL 60612
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include McLaren Health Plan Community.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Zachary Dean Demertzis Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Zachary Demertzis reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Henry Ford Health System
238 mi
Pediatrics
2799 W GRAND BLVD
Detroit, MI 48202
  • Reassigned Medicare billing, Michigan enrollment
  • 1,886 clinicians in this Medicare group
NPI 1003990318 (313) 916-2600

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$138.86 typical visit price
range $60.08 – $183.39
Typical copayment $34.71 (range $15.02 – $45.84)
Most-billed visit code 99204
Established Patient
$105.70 typical visit price
range $18.97 – $148.12
Typical copayment $26.42 (range $4.74 – $37.03)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

NICHOLAS RIGLER
Internal Medicine
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
KABEER RAJAN MASIH MD
Radiology (Vascular & Interventional Radiology)
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
MARGARET C SCHERMERHORN MD
Obstetrics & Gynecology
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
ANDREW MAX MELCHIORIS MD, MBA
Internal Medicine
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (314) 942-5000
NICOLE HALEY SULIMA DNP
Nurse Practitioner (Gerontology)
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
KRINA PATEL MD
Psychiatry & Neurology (Psychiatry)
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
LAYNE MITCHELL BESSA
Registered Nurse
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
COLETTE MITCHELL OT
Occupational Therapist
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5800

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 Zachary Demertzis's NPI number?

The NPI number for Zachary Demertzis is 1225534126. It was assigned to this individual provider in the NPPES registry on April 1, 2018.

Where is Zachary Demertzis located?

Zachary Demertzis practices at 1620 W Harrison St, Chicago, IL 60612. The listed phone number is (312) 942-5000.

What is Zachary Demertzis's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Clinical Cardiac Electrophysiology, with taxonomy code 207RC0001X.

Is Zachary Demertzis enrolled in Medicare?

Yes. Zachary Demertzis is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Zachary Demertzis's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Demertzis reassigns Medicare benefits to Henry Ford Health System (Detroit, MI). The 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 Zachary Demertzis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Zachary Demertzis accept?

Health plans from McLaren Health Plan Community list Zachary Demertzis 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.

When was this NPI record last updated?

The NPPES record for Zachary Demertzis was last updated on June 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months 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.