Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mainstay Clinics Inc

Organization Primary Care Clinic/Center · NPI 1053816405

Mainstay Clinics Inc is a Primary Care Clinic/Center in Libertyville, Illinois. Works from 2 locations. Registered with an NPI since 2018.

In the registry since
2018
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

333 Peterson Rd Ste 240
Libertyville, IL 60048-1085
Phone: (224) 864-2124
Fax: (224) 246-8125
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 408 N Seymour Ave, Mundelein, IL 60060-1835 — (224) 303-4138

Specialties & licences

Primary Care Clinic/Center (primary) Taxonomy 261QP2300X

Record details

NPI number1053816405
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Alexander Jarosz — Treasurer · (224) 717-0447
NPI enumeratedMarch 28, 2018
Last updated in NPPESApril 3, 2026
Certification dateApril 3, 2026
Mailing address17942 W Pond Ridge Cir, Gurnee, IL 60031-4534

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