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DR. LUCAS ANDREW WALKER MD
NPI 1780181529
Pediatrics - Pediatric Critical Care Medicine in Chicago, IL

Active since April 09, 2018PECOS Enrolled
5841 S MARYLAND AVE # L-444, CHICAGO, IL 60637(773) 834-3860 Get Directions Write a Review

NPPES record last updated: June 7, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jun 7, 2023, Jun 14, 2021, Apr 9, 2018 (3 updates tracked since 2018).

About Dr. Lucas Andrew Walker Md NPPES

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

DR. LUCAS ANDREW WALKER MD (NPI 1780181529) is an individual pediatric critical care medicine provider in Chicago, Illinois, licensed in Illinois (036164381) and active in the NPI registry since April 2018. He is enrolled in Medicare PECOS, maintains a secondary practice location in Washington, and is a graduate of Other (2018).

NPPES Registry Identity

NPI1780181529
Entity TypeIndividualMale
Primary Taxonomy2080P0203X
Provider Legal NameDR. LUCAS ANDREW WALKERCredential: MD
Location Address5841 S MARYLAND AVE # L-444Chicago, IL 60637-1443
Mailing Address180 Harvester Dr Ste 110Burr Ridge, IL 60527-6686 · (737) 702-1150
Phone(773) 834-3860
Sole ProprietorYes
Medical School CMSOtherGraduated 2018
Enumeration DateApril 9, 2018
Last NPPES UpdateJune 7, 20233 updates tracked since enumeration
NPPES CertifiedJune 7, 2023
✔ NPI 1780181529 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatrics · Pediatric Critical Care MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2080P0203X
License✔ Licensed in IL · 036164381
Definition
A pediatrician expert in advanced life support for children from the term or near-term neonate to the adolescent. This competence extends to the critical care management of life-threatening organ system failure from any cause in both medical and surgical patients and to the support of vital physiological functions. This specialist may have administrative responsibilities for intensive care units and also facilitates patient care among other specialists.
Also ListedPediatricsTaxonomy 208000000X · License MD2000024 (DC)
5841 S MARYLAND AVE # L-444, Chicago, IL 60637
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Secondary Practice Location 1

Location 1111 Michigan Ave NWWashington, DC 20010-2916 · Phone (202) 476-5000

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. Lucas Andrew Walker Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2769836501
PECOS Enrollment IDI20260716004393
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 Lucas Walker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Loyola University Medical Center
13 mi
General Practice
2160 S 1ST AVE
Maywood, IL 60153
  • Reassigned Medicare billing, Illinois enrollment
  • 1,138 clinicians in this Medicare group
NPI 1336159961 (708) 216-3215

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

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 Lucas Walker's NPI number?

The NPI number for Lucas Walker is 1780181529. It was assigned to this individual provider in the NPPES registry on April 9, 2018.

Where is Lucas Walker located?

Lucas Walker practices at 5841 S Maryland Ave # L-444, Chicago, IL 60637. The listed phone number is (773) 834-3860.

What is Lucas Walker's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Critical Care Medicine, with taxonomy code 2080P0203X.

Is Lucas Walker enrolled in Medicare?

Yes. Lucas Walker is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Lucas Walker's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Lucas Walker reassigns Medicare benefits to Loyola University Medical Center (Maywood, 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 Lucas Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Lucas Walker accept?

Health plans from Oscar Health list Lucas Walker 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 Lucas Walker was last updated on June 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.