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Deactivated NPI 1689643389 Deactivated / Inactive NPI Male Practitioner

Dr. Kyung W Koo , MD

Internal Medicine • Elgin, IL

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Notice of NPI Deactivation & Inactive Practice Status

According to official public domain records published by CMS (Centers for Medicare & Medicaid Services) in the National Provider Identifier (NPPES) Registry, Dr. Kyung Koo has officially deactivated this NPI record and ceased active healthcare practice.

Registration / Start Date March 15, 2006
NPI Deactivation Date June 04, 2026
Total Practice Duration ~20 Years of Practice (2006 – 2026)

Professional Overview & Biography Verified Profile Summary

Dr. Kyung Koo, MD was a registered Internal Medicine practicing in Elgin, IL. Throughout an active medical career spanning 20 years, Dr. Koo provided care at the practice location at 745 FLETCHER DR until profile deactivation on 2026-06-04.

Practice Location & Contact Primary Location

Practice Address

745 Fletcher Dr
Suite 101

Elgin, IL 601234747

Telephone 8477423525
Fax 8477423585
Associated Practice Facility / Clinic
🏢 Urology, Ltd. Facility NPI 1730109505

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Elgin, IL

Active Practitioner
Practitioner Clinical Experience
Active
City Avg: 26.7 Yrs
State Avg: 28.9 Yrs
Regional Practice Density
64 Specialists

Practicing in Elgin, IL (7544 Statewide)

Telehealth Adoption Rate
26.6% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
67.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License IL 036048555

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

7 Associated Practitioners
Dr. Ilma Vahora , MD

Internal Medicine

NPI 1073194031

Doctor of Medicine (M.D.)

Dr. Richard Baley , MD

Internal Medicine

NPI 1184693327

Doctor of Medicine (M.D.)

NPI 1215197785

Doctor of Medicine (M.D.)

Dr. Dennis Flynn , MD

Internal Medicine

NPI 1295704435

Doctor of Medicine (M.D.)

NPI 1457573347

Doctor of Medicine (M.D.)

Dr. John Fiedler , MD

Internal Medicine

NPI 1487623716

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

7 Historical Events
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NPI Profile Deactivated June 04, 2026

Record deactivated on June 04, 2026

NPI Profile Active January 26, 2016

NPI status registered as active in NPPES database

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Updated Practice Location January 26, 2016

Registered at 745 FLETCHER DR, SUITE 101, ELGIN, IL 601234747 (Tel: 8477423525)

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Updated Business Mailing Address January 26, 2016

Registered at 37W 638 YORK LANE, ELGIN, IL 60124 (Tel: 8476087879)

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Provider Name / Credentials Updated January 26, 2016

Recorded as KYUNG KOO, M.D.

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Medical Taxonomy / Specialty Registered (Primary Specialty) January 26, 2016

Internal Medicine (License #036048555 in IL)

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Initial NPI Registration & Enumeration March 15, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1689643389
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: March 15, 2006
Last Update: January 26, 2016
Deactivation Date: June 04, 2026

Mailing Address

37w 638 York Lane

Elgin, IL 60124

Phone: 8476087879

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.