Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

TIMOTHY SEIJUNG OH MD
NPI 1750840856
Internal Medicine - Hematology & Oncology in Chicago, IL

Q: What is Timothy Oh's NPI number?

The NPI number for Timothy Oh is 1750840856. It was assigned to this individual provider in the NPPES registry on March 18, 2019.

Q: What is Timothy Oh's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Q: When was this NPI record last updated?

The NPPES record for Timothy Oh was last updated on July 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 45 days 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.

Active since March 18, 2019PECOS Enrolled

94.1/100

CMS Quality Rating

251 E HURON ST, CHICAGO, IL 60611(312) 926-2000 Get Directions Write a Review

NPPES record last updated: July 9, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 9, 2026, Aug 16, 2022, Jun 17, 2019 and 1 more (4 updates tracked since 2019).

On this page

About Timothy Seijung Oh Md NPPES

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

TIMOTHY SEIJUNG OH MD (NPI 1750840856) is an individual hematology & oncology provider in Chicago, Illinois, licensed in Illinois (036159429) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS and is a graduate of Wake Forest University School Of Medicine (2019).

NPPES Registry Identity

NPI1750840856

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameTIMOTHY SEIJUNG OHCredential: MD

Location Address251 E HURON STChicago, IL 60611-3055

Mailing Address2650 Ridge Ave Ste 1223Evanston, IL 60201-1700 · (847) 570-2040 · Fax (847) 733-5315

Phone(312) 926-2000

Sole ProprietorNo

Medical School CMSWake Forest University School Of MedicineGraduated 2019

Enumeration DateMarch 18, 2019

Last NPPES UpdateJuly 9, 20264 updates tracked since enumeration

NPPES CertifiedJuly 9, 2026

✔ NPI 1750840856 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

License✔ Licensed in IL · 036159429

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

Also ListedInternal MedicineTaxonomy 207R00000X · License 036159429 (IL)

Also ListedHospitalistTaxonomy 208M00000X · License 036159429 (IL)

251 E HURON ST, Chicago, IL 60611

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Timothy Seijung Oh Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID8729313168

PECOS Enrollment IDI20260601002069

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60611 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

$183.39 typical visit price

range $60.08 – $183.39

Typical copayment $45.84 (range $15.02 – $45.84)

Most-billed visit code 99205

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

Quality

82.59

Promoting Interoperability

100

Improvement Activities

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.

MARK WANG M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

251 E HURON ST, FEINBERG PAVILION
CHICAGO, IL 60611

Cook County (312) 503-8144

DR. MARLEY ANN DOYLE M/D.

Psychiatry & Neurology (Psychiatry)

251 E HURON ST, GALTER 3-150, C
CHICAGO, IL 60611

Cook County (312) 926-6895

CASSIDY SCHWAB MD

Anesthesiology