Mainstay Clinics Inc
NPI 1053816405 · Primary Care Clinic/Center · Libertyville, IL
Mainstay Clinics Inc is a Primary Care Clinic/Center organization in Libertyville, IL (NPI 1053816405).
Provider details
- NPI number
- 1053816405
- Entity type
- Organization
- Primary specialty
- Primary Care Clinic/CenterAmbulatory Health Care Facilities
- Organization subpart
- No
- Authorized official
- Alexander Jarosz, Treasurer(224) 717-0447
Specialties & taxonomies
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
8 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 408 N Seymour AveMundelein, IL 60060-1835Phone: (224) 303-4138
Registry dates
- Enumerated
- 2018-03-28
- Last updated
- 2026-04-03
- Certified
- 2026-04-03
Frequently asked questions
- What is Mainstay Clinics Inc's NPI number?
- Mainstay Clinics Inc's National Provider Identifier (NPI) is 1053816405, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mainstay Clinics Inc?
- Mainstay Clinics Inc is classified in the NPPES registry as Primary Care Clinic/Center (Ambulatory Health Care Facilities).
- Where is Mainstay Clinics Inc located?
- Mainstay Clinics Inc's practice location on file with NPPES is 333 Peterson Rd Ste 240, Libertyville, IL 60048-1085.
- What is Mainstay Clinics Inc's phone number?
- The practice phone number listed in the NPPES registry for Mainstay Clinics Inc is (224) 864-2124.
- Who is the authorized official for Mainstay Clinics Inc?
- The authorized official listed on Mainstay Clinics Inc's NPPES record is Alexander Jarosz, Treasurer. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mainstay Clinics Inc's NPI active?
- Yes — Mainstay Clinics Inc's NPI (1053816405) is active in the NPPES registry as of the last update on 2026-04-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.