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

DR. SUJATA A OAK MD
NPI 1275503849
Internal Medicine in Dekalb, IL

Active since January 25, 2006
HEALTH SERVICES, NORTHERN ILLINOIS UNIVERSITY, DEKALB, IL 60115(815) 753-1311(815) 753-9599 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Sujata A Oak Md NPPES

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

DR. SUJATA A OAK MD (NPI 1275503849) is an individual internal medicine provider in Dekalb, Illinois and active in the NPI registry since January 2006.

NPPES Registry Identity

NPI1275503849
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. SUJATA A OAKCredential: MD
Location AddressHEALTH SERVICES, NORTHERN ILLINOIS UNIVERSITYDekalb, IL 60115
Mailing Address813 Steeplechase RdSt Charles, IL 60174 · (630) 513-1359
Phone(815) 753-1311
Fax(815) 753-9599
Sole ProprietorNo
Enumeration DateJanuary 25, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1275503849 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
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.
HEALTH SERVICES, Dekalb, IL 60115
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Other Providers at the Same Location NPPES 3

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

DR. JOHN LANDIS BOWMAN MD
General Practice
HEALTH SERVICES, NORTHERN ILLINOIS UNIVERSITY
DEKALB, IL 60115
Dekalb County (815) 753-1311
DR. SHOBHA MAHADEVAN M.D.
Internal Medicine
HEALTH SERVICES, NORTHERN ILLINOIS UNIVERSITY, WIRTZ DRIVE
DEKALB, IL 60115
Dekalb County (815) 753-1311
DR. MICHAEL LOUIS BROWN MD
Family Medicine
HEALTH SERVICES, NORTHERN ILLINOIS UNIVERSITY
DEKALB, IL 60115
Dekalb County (815) 753-9598

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 Sujata Oak's NPI number?

The NPI number for Sujata Oak is 1275503849. It was assigned to this individual provider in the NPPES registry on January 25, 2006.

Where is Sujata Oak located?

Sujata Oak practices at Health Services Northern Illinois University, Dekalb, IL 60115. The listed phone number is (815) 753-1311.

What is Sujata Oak's specialty?

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

When was this NPI record last updated?

The NPPES record for Sujata Oak was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 39 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.