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DR. ZACHARY ALEXANDER WARREN MD
NPI 1669933222
Otolaryngology - Otolaryngic Allergy in Chicago, IL

Active since March 27, 2019PECOS EnrolledAccepts Medicare Assignment
5841 S MARYLAND AVE # MC1035, CHICAGO, IL 60637(773) 702-1865(773) 834-3888 Get Directions Write a Review

NPPES record last updated: September 18, 2024. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Sep 18, 2024, Jul 9, 2024, Jun 19, 2019 (3 updates tracked since 2019).

About Dr. Zachary Alexander Warren Md NPPES

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

DR. ZACHARY ALEXANDER WARREN MD (NPI 1669933222) is an individual otolaryngic allergy provider in Chicago, Illinois, licensed in Georgia (100647) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS and is a graduate of Other (2019).

NPPES Registry Identity

NPI1669933222
Entity TypeIndividualMale
Primary Taxonomy207YX0602X
Provider Legal NameDR. ZACHARY ALEXANDER WARRENCredential: MD
Location Address5841 S MARYLAND AVE # MC1035Chicago, IL 60637-1443
Mailing Address180 Harvester Dr Ste 110Burr Ridge, IL 60527-6686 · (773) 702-1150
Phone(773) 702-1865
Fax(773) 834-3888
Sole ProprietorYes
Medical School CMSOtherGraduated 2019
Enumeration DateMarch 27, 2019
Last NPPES UpdateSeptember 18, 20243 updates tracked since enumeration
NPPES CertifiedSeptember 18, 2024
✔ NPI 1669933222 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOtolaryngology · Otolaryngic AllergyAllopathic & Osteopathic Physicians
Taxonomy Code207YX0602X
License✔ Licensed in GA · 100647
Definition
An otolaryngologist who specializes in the diagnosis and treatment of otolaryngic allergies and other allergic diseases.
Also ListedOtolaryngologyTaxonomy 207Y00000X · License 100647 (GA), 125.075059 (IL)
5841 S MARYLAND AVE # MC1035, Chicago, IL 60637
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, 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 and accepts Medicare assignment

Dr. Zachary Alexander Warren 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.

PECOS PAC ID2860938636
PECOS Enrollment IDI20251210001931
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 Warren reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group
1,723 mi
Health Maintenance Organization
43112 N 15TH ST
Lancaster, CA 93534
  • Reassigned Medicare billing, California enrollment
  • 13,921 clinicians in this Medicare group
NPI 1982863783 (661) 726-2279

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

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ARUSHI PRASHANT MAHAJAN MD
Student in an Organized Health Care Education/Training Program
5841 S MARYLAND AVE # MC1035
CHICAGO, IL 60637
Cook County (773) 795-3210
SAMUEL ROBERT AUGER
Otolaryngology
5841 S MARYLAND AVE # MC1035
CHICAGO, IL 60637
Cook County (773) 702-1865
NICHOLAS JOHN OBERHELMAN MD
Otolaryngology
5841 S MARYLAND AVE # MC1035
CHICAGO, IL 60637
Cook County (773) 795-3210
TINA KIM LAM
Otolaryngology
5841 S MARYLAND AVE # MC1035
CHICAGO, IL 60637
Cook County (773) 795-3210
DR. MEGAN SOPHIA WU MD
Otolaryngology
5841 S MARYLAND AVE # MC1035
CHICAGO, IL 60637
Cook County (773) 795-3210
MARY HELEN KRESS
Otolaryngology
5841 S MARYLAND AVE # MC1035
CHICAGO, IL 60637
Cook County (773) 702-1865

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 Warren's NPI number?

The NPI number for Zachary Warren is 1669933222. It was assigned to this individual provider in the NPPES registry on March 27, 2019.

Where is Zachary Warren located?

Zachary Warren practices at 5841 S Maryland Ave # Mc1035, Chicago, IL 60637. The listed phone number is (773) 702-1865.

What is Zachary Warren's specialty?

The primary specialty registered for this NPI is Otolaryngology, specializing in Otolaryngic Allergy, with taxonomy code 207YX0602X.

Is Zachary Warren enrolled in Medicare?

Yes. Zachary Warren 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 organization bills Medicare for Zachary Warren's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Warren reassigns Medicare benefits to Southern California Permanente Medical Group (Lancaster, CA). 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 Warren's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Zachary Warren accept?

Health plans from Ambetter Health and Oscar Health list Zachary Warren 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 Warren was last updated on September 18, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.