Doctors Unlimited Service Corporation

Key facts

NPI: 1265739643
Entity type: Organization (NPI type 2)
Primary specialty: Internal Medicine Physician 207R00000X
License: 036118945 (IL)
Legal business name: DOCTORS UNLIMITED SERVICE CORPORATION
Practice address: 1750 E 87TH St Ste 109
Chicago, IL 60617-2706
Phone: (773) 933-9300
Fax: (773) 933-9302
NPI assigned: Feb 19, 2011
Organization subpart: No

Authorized official

Name: Dr. Otuonye Ezeribe Onyewuchi, MD, MPH
Title: President/Ceo
Phone: (773) 933-9300

Subparts reporting this organization as parent 1

Organizations that report themselves as subparts in NPPES and name this organization, in the same state, as their parent.

Integracare Clinic/Center · Chicago, IL · NPI 1679842470

NPPES parent name

Corporate family (same tax ID) 1

Organizations that report the same tax identification number in the National Provider Directory.

Integracare Clinic/Center · Chicago, IL · NPI 1679842470

NPD tax ID

Practitioners 4

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles.

Victor Okamgba Family Nurse Practitioner · Naperville, IL · NPI 1629434741

Medicare reassignment NPD IL
Otuonye E Onyewuchi, MD, MPH Internal Medicine Physician · Chicago, IL · NPI 1538354295

Medicare reassignment NPD IL · INTERNAL MEDICINE
Oluseun Osinowo Family Nurse Practitioner · Chicago, IL · NPI 1548614431

Medicare reassignment NPD IL
Cecilia Chidinma Isioma, NP Psychiatric/Mental Health Nurse Practitioner · Chicago, IL · NPI 1568217354

NPD (past)

Laboratory certificates & supplier records

Name & address match These CMS records do not include an NPI. They are shown here because their name and street address match this provider’s.

CLIA laboratory certificates

CLIA number	Laboratory	Certificate	Expires
14D2068239	Integracare Clinic (Dba) 1750 East 87TH St, Ste 109, Chicago, IL 60617	Certificate of waiver	Oct 29, 2027

Medicare participation

Medicare fee-for-service enrollment: Enrolled in IL

Medicare enrollment records

Enrollment ID	State	Provider type	PAC ID	Details
O20110429000125	IL	Part B Supplier - Clinic/Group Practice	7719162122	Receives reassigned benefits from 3 practitioners Practice locations: Chicago, IL

National Provider Directory

Tax ID family: Doctors Unlimited Service Corporation (2 organizations share this tax ID)

Locations

1750 E 87th St
Chicago, IL 60617
Phone (312) 437-4444

Specialties & licenses

Specialty (taxonomy)	Code	License	State	Primary
Internal Medicine Physician Group: 193400000X SINGLE SPECIALTY GROUP	207R00000X	036118945	IL	Yes

Addresses

Primary practice location

1750 E 87TH St Ste 109
Chicago, IL 60617-2706

Mailing address

PO Box 806112
Chicago, IL 60680-4122
Phone (773) 933-9300

Other names

Integracare Clinic Doing business as

Other providers in Chicago, IL

All providers in Chicago, IL · Internal Medicine Physician in Illinois

Sources for this page

NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Record last updated by the provider on Jan 15, 2026. Information in NPPES is self-reported and not verified by CMS.
NUCC Health Care Provider Taxonomy: specialty names.
Medicare Fee-For-Service Public Provider Enrollment (CMS/PECOS): enrollments, PAC IDs and benefit reassignments.
Medicare Care Compare provider data (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.