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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. HAROLD B EULIEN JR.
NPI 1700877222
Internal Medicine in Chicago, IL

Active since November 03, 2005
2800 N SHERIDAN RD, SUITE 107, CHICAGO, IL 60657(773) 525-4740(773) 525-4022 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Harold B Eulien Jr. NPPES

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

DR. HAROLD B EULIEN JR. (NPI 1700877222) is an individual internal medicine provider in Chicago, Illinois and active in the NPI registry since November 2005.

NPPES Registry Identity

NPI1700877222
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. HAROLD B EULIEN JR.
Location Address2800 N SHERIDAN RD, SUITE 107Chicago, IL 60657-6156
Mailing Address4250 N Marine Dr, Suite 236Chicago, IL 60613-1744 · (773) 404-0160 · Fax (773) 404-9876
Phone(773) 525-4740
Fax(773) 525-4022
Sole ProprietorNo
Enumeration DateNovember 3, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1700877222 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.
2800 N SHERIDAN RD, Chicago, IL 60657
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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. MARTIN ALAN HIRSCH D.M.D.
Dentist (Prosthodontics)
2800 N SHERIDAN RD, SUITE 204
CHICAGO, IL 60657
Cook County (773) 248-6140
CARDIOMEDICAL ASSOC, LTD.
Specialist
2800 N SHERIDAN RD, SUITE 100
CHICAGO, IL 60657
Cook County (773) 929-1900
RUPERTO MAYUGA M.D.
Internal Medicine (Cardiovascular Disease)
2800 N SHERIDAN RD, SUITE 303
CHICAGO, IL 60657
Cook County (773) 281-7660
DR. THEODORE B HANDRUP MD
Psychiatry & Neurology (Psychiatry)
2800 N SHERIDAN RD, SUITE 502
CHICAGO, IL 60657
Cook County (773) 472-1483
DR. HOURI H SHAFAIE DDS
Dentist
2800 N SHERIDAN RD, SUITE 400
CHICAGO, IL 60657
Cook County (773) 880-5080
DR. SCOTT PORTER NEELEY
Internal Medicine (Pulmonary Disease)
2800 N SHERIDAN RD, STE 301
CHICAGO, IL 60657
Cook County (773) 935-5556
DR. KAMAL K CHAWLA MD
Internal Medicine (Interventional Cardiology)
2800 N SHERIDAN RD, SUITE 510
CHICAGO, IL 60657
Cook County (773) 348-7555
MISS SANGINI DINESH PATEL PAC
Dermatology
2800 N SHERIDAN RD, SUITE #210
CHICAGO, IL 60657
Cook County (773) 281-0046

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 Harold Eulien's NPI number?

The NPI number for Harold Eulien is 1700877222. It was assigned to this individual provider in the NPPES registry on November 3, 2005.

Where is Harold Eulien located?

Harold Eulien practices at 2800 N Sheridan Rd Suite 107, Chicago, IL 60657. The listed phone number is (773) 525-4740.

What is Harold Eulien'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 Harold Eulien 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 23 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.