1. Home
  2. Directory
  3. Illinois
  4. Chicago
  5. Pediatrics
  6. NPI Profile

DR. ZACHARY ALESSANDRO MARCUS MD
NPI 1649624644
Pediatrics in Chicago, IL

Active since April 16, 2016PECOS Enrolled
840 E 59TH ST, MC 3052, CHICAGO, IL 60637(773) 834-9355 Get Directions Write a Review

NPPES record last updated: September 24, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 24, 2021, Jul 24, 2019 (2 updates tracked since 2019).

About Dr. Zachary Alessandro Marcus Md NPPES

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

DR. ZACHARY ALESSANDRO MARCUS MD (NPI 1649624644) is an individual pediatrics provider in Chicago, Illinois, licensed in Illinois (036147138) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1649624644
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameDR. ZACHARY ALESSANDRO MARCUSCredential: MD
Location Address840 E 59TH ST, MC 3052Chicago, IL 60637
Mailing Address840 E 59th St, Mc 3052Chicago, IL 60637 · (773) 834-9355
Phone(773) 834-9355
Sole ProprietorNo
Enumeration DateApril 16, 2016
Last NPPES UpdateSeptember 24, 20212 updates tracked since enumeration
NPPES CertifiedSeptember 9, 2021
✔ NPI 1649624644 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in IL · 036147138
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
840 E 59TH ST, Chicago, IL 60637
Open in Google Maps ↗

Accepted Insurance

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

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Zachary Alessandro Marcus Md 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 Marcus reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Endeavor Health Medical Group
20 mi
Allergy & Immunology
1000 CENTRAL ST
Evanston, IL 60201
  • Reassigned Medicare billing, Illinois enrollment
  • 4,841 clinicians in this Medicare group
NPI 1497701882 (847) 570-5235

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 60637 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
$94.06 typical visit price
range $60.08 – $183.39
Typical copayment $23.51 (range $15.02 – $45.84)
Most-billed visit code 99203
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.

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 Marcus's NPI number?

The NPI number for Zachary Marcus is 1649624644. It was assigned to this individual provider in the NPPES registry on April 16, 2016.

Where is Zachary Marcus located?

Zachary Marcus practices at 840 E 59th St Mc 3052, Chicago, IL 60637. The listed phone number is (773) 834-9355.

What is Zachary Marcus's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Zachary Marcus enrolled in Medicare?

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

Which organization bills Medicare for Zachary Marcus's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Marcus reassigns Medicare benefits to Endeavor Health Medical Group (Evanston, IL). 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 Marcus's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Zachary Marcus accept?

Health plans from Oscar Health list Zachary Marcus 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 Marcus was last updated on September 24, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.