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NPISignal

Individual Healthcare Provider

Nathan Charles Nowalk, M.D.

NPI Record: ActiveInternal Medicine — Pulmonary Disease
NPI1003298720
Chicago, Illinois

Provider's NPPES record last updated: September 10, 2025

Overview

Entity Type
Individual Healthcare Provider
NPI
1003298720
Primary Specialty
Internal Medicine — Pulmonary Disease
Practice Location
Chicago, Illinois
Sole Proprietor
No

Federal Screening

NPISignal checked this NPI against federal exclusion sources. Results below are based on the NPI number itself — an identifier match, not a name match.

List of Excluded Individuals/Entities (LEIE)

HHS Office of Inspector General

No potential match identified

No potential match was identified in NPISignal's indexed List of Excluded Individuals/Entities (LEIE) records as of 2026-09-10.

Source data
September 10, 2026
Records indexed
84,001
Screened
Sep 17, 2026, 11:12 PM UTC

This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.

SAM.gov Exclusions

U.S. General Services Administration

Not checked

SAM.gov Exclusions was not checked.

SAM.gov screening is not configured on this deployment. No SAM check has been performed.

Screened
Not checked

This is an NPI-based check only. NPISignal does not publish name-based exclusion matches on a provider profile. A shared or similar name is a lead that requires human review, not an identification, and this page is not the place to make one. Run a name-based screening below to see potential matches with the reasons for each.

This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.

Run a name-based screening

Searches OIG LEIE and SAM.gov by name and reviews every potential match.

Specialties & Taxonomies

  • Internal Medicine

    Pulmonary Disease

    Allopathic & Osteopathic Physicians

    Primary

    An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.

    Taxonomy code 207RP1001X
  • Internal Medicine

    Sleep Medicine

    Allopathic & Osteopathic Physicians

    An Internist who practices Sleep Medicine is certified in the subspecialty of sleep medicine and specializes in the clinical assessment, physiologic testing, diagnosis, management and prevention of sleep and circadian rhythm disorders. Sleep specialists treat patients of any age and use multidisciplinary approaches. Disorders managed by sleep specialists include, but are not limited to, sleep related breathing disorders, insomnia, hypersomnias, circadian rhythm sleep disorders, parasomnias and sleep related movement disorders.

    Taxonomy code 207RS0012X
  • Internal Medicine

    Critical Care Medicine

    Allopathic & Osteopathic Physicians

    An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.

    Taxonomy code 207RC0200X

Provider-Reported License Information

Internal Medicine (Illinois)
036152140
Internal Medicine (Pennsylvania)
MD490543
Internal Medicine (Illinois)
036152140
License numbers are reported by the provider to NPPES and are not independently verified by NPISignal against any state licensing board. Confirm current license status directly with the issuing state board.

Practice Locations

Practice Location

5841 S Maryland Ave

Chicago, Illinois 60637-1443

Phone: (888) 824-0200

Additional Practice Location

3624 Market St Ste 201

Philadelphia, Pennsylvania 19104-2614

Phone: (215) 662-7772

Record Information

Enumeration Date
June 18, 2015
Provider's NPPES Record Last Updated
September 10, 2025
Certification Date
September 10, 2025
NPISignal NPPES Dataset
August 2026

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