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DR. THOMAS H OH M.D.
NPI 1033275276
Emergency Medicine in Naperville, IL

Active since December 30, 2006PECOS EnrolledAccepts Medicare Assignment
95.01/100
CMS Quality Rating
801 S WASHINGTON ST, EMERGENCY MEDICINE, NAPERVILLE, IL 60540(630) 527-3000 Get Directions Write a Review

NPPES record last updated: December 1, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Thomas H Oh M.d. NPPES

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

DR. THOMAS H OH M.D. (NPI 1033275276) is an individual emergency medicine provider in Naperville, Illinois, licensed in Illinois (036-106421) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS, is affiliated with Edward Hospital, and is a graduate of Loma Linda University School Of Medicine (1999).

NPPES Registry Identity

NPI1033275276
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameDR. THOMAS H OHCredential: M.D.
Location Address801 S WASHINGTON ST, EMERGENCY MEDICINENaperville, IL 60540-7430
Mailing Address2650 Ridge Ave., 1223Evanston, IL 60201-1718 · (847) 570-2040
Phone(630) 527-3000
Sole ProprietorNo
Medical School CMSLoma Linda University School Of MedicineGraduated 1999
Enumeration DateDecember 30, 2006
Last NPPES UpdateDecember 1, 2025
NPPES CertifiedDecember 1, 2025
✔ NPI 1033275276 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in IL · 036-106421
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
801 S WASHINGTON ST, Naperville, IL 60540
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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

Dr. Thomas H Oh 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 ID5890718928
PECOS Enrollment IDI20060104000489, I20060124000651
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

5

Medicare enrollment records show Thomas Oh reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Edward Hospital
Same address
General Acute Care Hospital
801 S WASHINGTON ST
Naperville, IL 60540
  • Reassigned Medicare billing, Illinois enrollment
  • 268 clinicians in this Medicare group
NPI 1013969013 (630) 655-0450
Endeavor Health Medical Group
32 mi
Allergy & Immunology
1000 CENTRAL ST
Evanston, IL 60201
  • Reassigned Medicare billing, Illinois enrollment
  • 4,841 clinicians in this Medicare group
NPI 1497701882 (847) 570-5235
Midwest Medical Center
113 mi
Clinic/Center
117 N MAIN ST
Elizabeth, IL 61028
  • Reassigned Medicare billing, Illinois enrollment
  • Also billed through NPI 1952409765 (Illinois)
  • 51 clinicians in this Medicare group
NPI 1295126944 (815) 858-2238
Napa Valley Emergency Medical Group
1,814 mi
Emergency Medicine
1000 TRANCAS ST
Napa, CA 94558
  • Reassigned Medicare billing, California enrollment
  • 53 clinicians in this Medicare group
NPI 1467463539 (818) 340-9988
Pacific Redwood Medical Group Inc
1,843 mi
Emergency Medicine
275 HOSPITAL DR
Ukiah, CA 95482
  • Reassigned Medicare billing, California enrollment
  • 112 clinicians in this Medicare group
NPI 1033103676 (707) 462-7900

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 8

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.
136 services132 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
133 services129 patients
Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
44 services43 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
32 services32 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
28 services27 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
27 services27 patients

Hospital Affiliations CMS Care Compare 2

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

Edward Hospital

Acute Care Hospitals · Naperville, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140231
Location801 South WashingtonNaperville, IL 60540 · Du Page County
Emergency services Birthing friendly

Midwest Medical Center

Critical Access Hospitals · Galena, IL
OwnershipVoluntary non-profit - Private
CMS Certification Number141302
Location1 Medical Center DriveGalena, IL 61036 · Jo Daviess County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60540 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
$93.02 typical visit price
range $59.81 – $181.38
Typical copayment $23.25 (range $14.95 – $45.34)
Most-billed visit code 99203
Established Patient
$105.07 typical visit price
range $19.15 – $147.12
Typical copayment $26.26 (range $4.78 – $36.78)
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.

95.01/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality80.02
Promoting Interoperability100
Improvement Activities40

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.

DR. HAFEZ M. SAMI M.D.
Pain Medicine (Interventional Pain Medicine)
801 S WASHINGTON ST
NAPERVILLE, IL 60540
Dupage County (630) 348-3300
MICHAEL J. HARTMANN MD
Emergency Medicine
801 S WASHINGTON ST
NAPERVILLE, IL 60540
Dupage County (630) 527-3000
SEEMA ISHAQ JEELANI D.O.
Emergency Medicine
801 S WASHINGTON ST
NAPERVILLE, IL 60540
Dupage County (630) 527-3000
CORTNEY COLE MD
Family Medicine (Hospice and Palliative Medicine)
801 S WASHINGTON ST
NAPERVILLE, IL 60540
Dupage County (630) 527-3000
EDWARD HOSPITAL
General Acute Care Hospital
801 S WASHINGTON ST
NAPERVILLE, IL 60540
Dupage County (630) 655-0450
DR. HODA A. EL- ASMAR MD
Internal Medicine (Infectious Disease)
801 S WASHINGTON ST, EDWARD HOSPITAL, ADMINISTRATION, VPMA OFFICE
NAPERVILLE, IL 60540
Dupage County (630) 527-5647
AMAAR MASOOD MALIK DO
Radiology (Diagnostic Radiology)
801 S WASHINGTON ST
NAPERVILLE, IL 60540
Dupage County (630) 527-3200
DR. SANGITA RANGALA M.D.
Emergency Medicine
801 S WASHINGTON ST
NAPERVILLE, IL 60540
Dupage County (630) 527-3288

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 Thomas Oh's NPI number?

The NPI number for Thomas Oh is 1033275276. It was assigned to this individual provider in the NPPES registry on December 30, 2006.

Where is Thomas Oh located?

Thomas Oh practices at 801 S Washington St Emergency Medicine, Naperville, IL 60540. The listed phone number is (630) 527-3000.

What is Thomas Oh's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Thomas Oh enrolled in Medicare?

Yes. Thomas Oh 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 Thomas Oh's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Oh reassigns Medicare benefits to 5 organizations: Edward Hospital (Naperville, IL), Endeavor Health Medical Group (Evanston, IL), Midwest Medical Center (Elizabeth, IL), Napa Valley Emergency Medical Group (Napa, CA) and Pacific Redwood Medical Group Inc (Ukiah, CA). 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 Thomas Oh's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Thomas Oh affiliated with any hospitals?

According to CMS data, Thomas Oh is affiliated with Edward Hospital and Midwest Medical Center.

When was this NPI record last updated?

The NPPES record for Thomas Oh was last updated on December 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.