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NORTHWESTERN INTERNISTS, LTD
NPI 1891709259
Internal Medicine in Chicago, IL

Active since July 28, 2006CLIA 14D0707039 · Microscopy
676 N SAINT CLAIR ST, SUITE 415, CHICAGO, IL 60611(312) 335-1133(312) 335-9774 Get Directions Write a Review

NPPES record last updated: January 14, 2013. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Northwestern Internists, Ltd NPPES

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

NORTHWESTERN INTERNISTS, LTD (NPI 1891709259) is a healthcare organization registered as an internal medicine in Chicago, Illinois and active in the NPI registry since July 2006. The organization holds a CLIA Microscopy certificate valid through April 6, 2028 and lists James Pekarek, Practice Administrator, as its authorized official.

NPPES Registry Identity

NPI1891709259
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameNORTHWESTERN INTERNISTS, LTD
Location Address676 N SAINT CLAIR ST, SUITE 415Chicago, IL 60611-2927
Mailing Address676 N Saint Clair St, Suite 415Chicago, IL 60611-2927 · (312) 335-1133 · Fax (312) 335-9774
Phone(312) 335-1133
Fax(312) 335-9774
Organization SubpartNo
Authorized OfficialJames PekarekPractice Administrator · (312) 335-1133
Enumeration DateJuly 28, 2006
Last NPPES UpdateJanuary 14, 2013
✔ NPI 1891709259 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 · 207R00000X
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.
676 N SAINT CLAIR ST, Chicago, IL 60611
Open in Google Maps ↗

Other Identifiers 1

Medicare ID-Type Unspecified964030IL · Medicare Group #

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 14D0707039

Northwestern Internists Ltd · Chicago, IL
Active · expires Apr 6, 2028
CLIA Number14D0707039
Laboratory TypePhysician Office
Certificate Effective DateApril 7, 2026
Certificate Expiration DateApril 6, 2028
Laboratory DirectorBeth E. Royston, MD
Laboratory Phone(312) 335-1133
Laboratory LocationNorthwestern Internists Ltd676 N St Clair Suite 415, Chicago, IL 60611
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

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.

MS. LISA RAUBOLT
Social Worker (Clinical)
676 N SAINT CLAIR ST
CHICAGO, IL 60611
Cook County (312) 926-4512
JULIANNA L ROTH MD
Internal Medicine
676 N SAINT CLAIR ST, SUITE 2300
CHICAGO, IL 60611
Cook County (312) 926-6000
ANKIT BHARAT MD
Thoracic Surgery (Cardiothoracic Vascular Surgery)
676 N SAINT CLAIR ST, SUITE 650
CHICAGO, IL 60611
Cook County (312) 926-7628
JOAQUIN CARLOS BRIEVA MD
Dermatology
676 N SAINT CLAIR ST, SUITE 1600
CHICAGO, IL 60611
Cook County (312) 695-8106
JOHN M SHAW MD
Internal Medicine (Medical Oncology)
676 N SAINT CLAIR ST, STE 2140
CHICAGO, IL 60611
Cook County (312) 664-5400
MELVIN J GOLDSTEIN, M.D.,S.C.
Internal Medicine (Gastroenterology)
676 N SAINT CLAIR ST, SUITE 1525
CHICAGO, IL 60611
Cook County (312) 337-1556
DR. HOWARD M. AROF M.D.
Obstetrics & Gynecology
676 N SAINT CLAIR ST, #1880
CHICAGO, IL 60611
Cook County (312) 642-9844
DR. MARIA MATSANGOU M.D.
Internal Medicine (Hematology & Oncology)
676 N SAINT CLAIR ST, SUITE 850
CHICAGO, IL 60611
Cook County (312) 695-6182

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 Northwestern Internists, Ltd's NPI number?

The NPI number for Northwestern Internists, Ltd is 1891709259. It was assigned to this organization in the NPPES registry on July 28, 2006.

Where is Northwestern Internists, Ltd located?

Northwestern Internists, Ltd is located at 676 N Saint Clair St Suite 415, Chicago, IL 60611. The listed phone number is (312) 335-1133.

What is Northwestern Internists, Ltd's specialty?

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

Does Northwestern Internists, Ltd hold a CLIA laboratory certificate?

Yes. A Certificate for Provider-Performed Microscopy Procedures (PPMP) (number 14D0707039) is associated with this NPI, valid through April 6, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Northwestern Internists, Ltd was last updated on January 14, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.