NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Chicago South Orthopedics, Inc

Specialist in Oak Lawn, IL · enumerated 2007 · authorized official Mark Nikkel, Orthopedic Surgen.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1023138633

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Chicago South Orthopedics, Inc
Practice address 5540 W 111th St, Oak Lawn, IL, 60453
Phone (708) 423-8440
Fax (708) 658-2958
Enumeration date Mar 29, 2007
Last updated in NPPES May 21, 2020

Taxonomy & classification

174400000X Specialist Other Service Providers Primary

Authorized official

Name Mark Nikkel
Title Orthopedic Surgen
Phone (708) 423-8440

Other identifiers

Identifier Type State Issuer
31622992 Other IL BCBS
1699762336 Other IL NPI # INDIV.
$$$$$$$$$ Other IL SSN

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Who is the authorized official for Chicago South Orthopedics, Inc?
NPPES lists Mark Nikkel (Orthopedic Surgen) as the authorized official for this organization.
What is the NPI number for Chicago South Orthopedics, Inc?
The NPI for Chicago South Orthopedics, Inc is 1023138633, a Type 2 (organization) record in the CMS NPPES registry.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-05-21.