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JAH-WON KOO M.D.
NPI 1235241837
Internal Medicine in Chicago, IL

Active since August 31, 2006PECOS EnrolledAccepts Medicare Assignment
94.1/100
CMS Quality Rating
1700 W VAN BUREN ST, SUITE 500, CHICAGO, IL 60612(312) 563-2875(312) 942-3012 Get Directions Write a Review

NPPES record last updated: February 12, 2008. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Jah-won Koo M.d. NPPES

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

JAH-WON KOO M.D. (NPI 1235241837) is an individual internal medicine provider in Chicago, Illinois, licensed in Illinois (036-097878) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Palos Community Hospital, and is a graduate of University Of Cincinnati College Of Medicine (1995).

NPPES Registry Identity

NPI1235241837
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameJAH-WON KOOCredential: M.D.
Location Address1700 W VAN BUREN ST, SUITE 500Chicago, IL 60612-3218
Mailing Address1700 W Van Buren St, Suite 500Chicago, IL 60612-3218 · (312) 563-2875 · Fax (312) 942-3012
Phone(312) 563-2875
Fax(312) 942-3012
Sole ProprietorNo
Medical School CMSUniversity Of Cincinnati College Of MedicineGraduated 1995
Enumeration DateAugust 31, 2006
Last NPPES UpdateFebruary 12, 2008
✔ NPI 1235241837 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in IL · 036-097878
Definition
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.
1700 W VAN BUREN ST, Chicago, IL 60612
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Other Identifiers 2

Medicare ID-Type UnspecifiedL67607IL
Medicare UPING84778IL

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

Jah-won Koo M.d. 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 ID1951587807
PECOS Enrollment IDI20110511000165
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 Reassignments

2

Medicare enrollment records show Jah-won Koo reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Rush University Medical Center
0.2 mi
Diagnostic Radiology
1620 W HARRISON ST
Chicago, IL 60612
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Rush University Medical Group
  • 2,169 clinicians in this Medicare group
NPI 1184269425 (312) 563-4270
Northwestern Medical Faculty Foundation
32 mi
Multi-Specialty
DEPT 5777
Carol Stream, IL 60122
  • Reassigned Medicare billing, Illinois enrollment
  • 4,817 clinicians in this Medicare group
NPI 1346235314 (855) 694-2866

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

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
254 services140 patients
Insertion of needle into vein for collection of blood sample 36415
This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.
113 services80 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
88 services88 patients
Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use 90677
The Pneumococcal Conjugate Vaccine (PCV20) is a shot given to protect against 20 types of bacteria that can cause serious infections like pneumonia and meningitis. It's administered through a muscle, usually in the arm. It's important for overall health.
31 services31 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
31 services28 patients
Administration of pneumococcal vaccine G0009
The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.
31 services31 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Palos Community Hospital

Acute Care Hospitals · Palos Heights, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140062
Location12251 South 80th AvenuePalos Heights, IL 60463 · Cook County
Emergency services Birthing friendly

Northwestern Lake Forest Hospital

Acute Care Hospitals · Lake Forest, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number140130
Location1000 N Westmoreland RoadLake Forest, IL 60045 · Lake County
Emergency services Birthing friendly

Northwestern Medicine Central Dupage Hospital

Acute Care Hospitals · Winfield, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140242
Location25 North Winfield RoadWinfield, IL 60190 · Du Page County
Emergency services Birthing friendly

Northwestern Memorial Hospital

Acute Care Hospitals · Chicago, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140281
Location251 E Huron StChicago, IL 60611 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$138.86 typical visit price
range $60.08 – $183.39
Typical copayment $34.71 (range $15.02 – $45.84)
Most-billed visit code 99204
Established Patient
$105.70 typical visit price
range $18.97 – $148.12
Typical copayment $26.42 (range $4.74 – $37.03)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

94.1/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality82.59
Promoting Interoperability100
Improvement Activities40

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
1 supplier11 claims11 services$67.52 avg. paid by Medicare
Portable gaseous oxygen system, rental; home compressor used to fill portable oxygen cylinders; includes portable containers, regulator, flowmeter, humidifier, cannula or mask, and tubing K0738
DME-Oxygen and Supplies · category DC000N
1 supplier11 claims11 services$32.33 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

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

ANN GOH M.D.
Hospitalist
1700 W VAN BUREN ST, SUITE 500
CHICAGO, IL 60612
Cook County (312) 563-2875
STEPHANIE LYNN CRANE M.D.
Internal Medicine
1700 W VAN BUREN ST, SUITE 500
CHICAGO, IL 60612
Cook County (312) 563-2875
RUPEL DEDHIA M.D.
Internal Medicine
1700 W VAN BUREN ST, 5TH FLOOR
CHICAGO, IL 60612
Cook County (312) 563-2875
CATHERINE DIMOU M.D.
Hospitalist
1700 W VAN BUREN ST, SUITE 500
CHICAGO, IL 60612
Cook County (312) 563-2875
DANIEL ALLEN OKAMOTO M.D.
Internal Medicine
1700 W VAN BUREN ST, SUITE 500
CHICAGO, IL 60612
Cook County (312) 942-4200
GINA KRING M.D.
Family Medicine
1700 W VAN BUREN ST, SUITE 470
CHICAGO, IL 60612
Cook County (312) 942-0400
CYNTHIA LOUIE M.D.
Internal Medicine
1700 W VAN BUREN ST, SUITE 500
CHICAGO, IL 60612
Cook County (312) 563-2875
DR. USAMA ZIA AHMAD M.D.
Internal Medicine
1700 W VAN BUREN ST, SUITE 500
CHICAGO, IL 60612
Cook County (312) 563-2875

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 Jah-won Koo's NPI number?

The NPI number for Jah-won Koo is 1235241837. It was assigned to this individual provider in the NPPES registry on August 31, 2006.

Where is Jah-won Koo located?

Jah-won Koo practices at 1700 W Van Buren St Suite 500, Chicago, IL 60612. The listed phone number is (312) 563-2875.

What is Jah-won Koo's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Jah-won Koo enrolled in Medicare?

Yes. Jah-won Koo 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 organizations bill Medicare for Jah-won Koo's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Jah-won Koo reassigns Medicare benefits to 2 organizations: Rush University Medical Center (Chicago, IL) and Northwestern Medical Faculty Foundation (Carol Stream, IL). Each 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 Jah-won Koo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Jah-won Koo affiliated with any hospitals?

According to CMS data, Jah-won Koo is affiliated with Palos Community Hospital, Northwestern Lake Forest Hospital, Northwestern Medicine Central Dupage Hospital and Northwestern Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Jah-won Koo was last updated on February 12, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.