Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Stephen Byungchul Kwak, DO

Diagnostic Radiology Physician in Lake Forest, IL · enumerated 2014.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1831517580

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Registry record

Entity type Individual (Type 1)

Name Dr. Stephen Byungchul Kwak

Credential DO

Sex Male

Practice address 1000 N Westmoreland Rd, Lake Forest, IL, 60045

Phone (847) 234-5600

Fax (847) 535-7847

Enumeration date Mar 31, 2014

Last updated in NPPES Sep 24, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License OT016043 (PA) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 125066173 (IL) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 036152630 (IL) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify Stephen Kwak's NPI record?

Cross-check NPI 1831517580 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1831517580 active?

Yes, as of the latest NPPES snapshot, NPI 1831517580 is active (record last updated 2020-09-24).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-09-24.