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Mr.Oak

Adult Medicine Physician in Chicago, IL · enumerated 2018 · authorized official Steven Smith, Medical Director.

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

National Provider Identifier

1164917720

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Registry record

Entity type Organization (Type 2)
Legal business name Mr.Oak
Practice address 3510 W 79th St, Chicago, IL, 60652
Phone (312) 259-8555
Fax (773) 978-0705
Enumeration date Jun 26, 2018
Last updated in NPPES Jun 26, 2018

Taxonomy & classification

207QA0505X Adult Medicine Physician Allopathic & Osteopathic Physicians Primary
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Secondary

Authorized official

Name Steven Smith
Title Medical Director
Phone (312) 259-8555

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.

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Frequently asked questions

What is the NPI number for Mr.Oak?
The NPI for Mr.Oak is 1164917720, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for Mr.Oak?
NPPES lists Steven Smith (Medical Director) as the authorized official for this organization.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-26.