Mainstay Clinics Inc

Primary specialty

Primary Care Clinic/CenterTaxonomy code 261QP2300X

Legal business name

MAINSTAY CLINICS INC

Practice address

333 Peterson Rd Ste 240
Libertyville, IL 60048-1085

Phone

(224) 864-2124

Fax

(224) 246-8125

NPI assigned

Mar 28, 2018

Last updated

Apr 3, 2026By the provider in NPPES

Organization subpart

No

Registry information is reported by the provider to CMS and is not verified. About this source

Authorized official

Name

Alexander Jarosz

Title

Treasurer

Phone

(224) 717-0447

Specialties & licenses 1

Addresses

Other identifiers 1

Locations

Practitioners 1

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

• Alpha Jarosz, FNP

  • Family Nurse Practitioner
  • Libertyville, IL
  • NPI 1932479847
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1522195200000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1775174400000",
    "number": "1053816405",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "17942 W POND RIDGE CIR",
            "city": "GURNEE",
            "state": "IL",
            "postal_code": "600314534",
            "telephone_number": "224-303-4138"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "333 PETERSON RD STE 240",
            "city": "LIBERTYVILLE",
            "state": "IL",
            "postal_code": "600481085",
            "telephone_number": "224-864-2124",
            "fax_number": "224-246-8125"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "408 N Seymour Ave",
            "address_purpose": "LOCATION",
            "city": "Mundelein",
            "state": "IL",
            "postal_code": "600601835",
            "country_code": "US",
            "telephone_number": "224-303-4138",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "organization_name": "MAINSTAY CLINICS INC",
        "organizational_subpart": "NO",
        "enumeration_date": "2018-03-28",
        "last_updated": "2026-04-03",
        "certification_date": "2026-04-03",
        "status": "A",
        "authorized_official_last_name": "JAROSZ",
        "authorized_official_first_name": "ALEXANDER",
        "authorized_official_title_or_position": "TREASURER",
        "authorized_official_telephone_number": "224-717-0447"
    },
    "taxonomies": [
        {
            "code": "261QP2300X",
            "taxonomy_group": "",
            "desc": "Clinic/Center, Primary Care",
            "state": "NU",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "338829946001",
            "state": "IL"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Lauren Marie Mackinnon, DO
• Andres Felipe Mafla Grisales, MD
• Ola R Mahmood, D.M.D.
• Saba Mahmood
• Katelyn Ann Maier, DPT
• Mainstay Clinics Inc
• Kevin Majchrzak
• Xochitl Maldonado
• Brian Malinowski, LMFT
• Theresa Rose Malvar, PHARMD

• Primary Care Clinic/Center in Libertyville, IL
• Providers in Libertyville, IL by specialty
• Primary Care Clinic/Center in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 3, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.