Organization Active NPI

Tenacity Psychological Services, LLC

  • Clinical Psychologist
  • Chicago, IL
National Provider Identifier
1619530185
Registry record updated Feb 6, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Clinical PsychologistTaxonomy code 103TC0700X
Legal business name
TENACITY PSYCHOLOGICAL SERVICES, LLC
Practice address
8 S Michigan Ave Ste 1500
Chicago, IL 60603-3362
Phone
(872) 808-0285
Fax
(872) 804-2525
NPI assigned
Apr 19, 2019
Last updated
Feb 6, 2026By the provider in NPPES
Organization subpart
No

NPPES NPI Registry

Updated by the provider on Feb 6, 2026

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

Authorized official

Name
Dr. Josiah James Miller, PSYDNPI 1023521200
Title
Owner
Phone
(872) 808-0285

Authorized official NPPES reports the official by name only. The link goes to the one practitioner connected to this organization with that name.

Specialties & licenses 9

Specialty (taxonomy)CodeLicenseStatePrimary
Psychologist 103T00000X
Clinical Psychologist 103TC0700X Primary
Counseling Psychologist 103TC1900X
Clinical Child & Adolescent Psychologist 103TC2200X
Family Psychologist 103TF0000X
Health Service Psychologist 103TH0100X
Group Psychotherapy Psychologist 103TP2701X
Mental Health Clinic/Center (Including Community Mental Health Center) 261QM0801X
Health Psychologist 103TH0004X

Addresses

Primary practice location

8 S Michigan Ave Ste 1500
Chicago, IL 60603-3362

Mailing address

8 S Michigan Ave Ste 1500
Chicago, IL 60603-3362
Phone (872) 808-0285

Other identifiers 1

IdentifierTypeStateIssuer
523478244001MedicaidIL

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in IL

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
O20190514002371 IL Part B Supplier - Clinic/Group Practice 2466795448 Receives reassigned benefits from 2 practitioners
Practice locations: Chicago, IL

National Provider Directory

National Provider Directory

Locations

605 N Michigan Ave
Chicago, IL 60611
Phone (312) 242-2550

Practitioners & affiliated clinicians

Practitioners 2

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.

NPI Registry JSON

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

{
    "created_epoch": "1555632000000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1770336000000",
    "number": "1619530185",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8 S MICHIGAN AVE STE 1500",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606033362",
            "telephone_number": "872-808-0285",
            "fax_number": "872-804-2525"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "8 S MICHIGAN AVE STE 1500",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606033362",
            "telephone_number": "872-808-0285",
            "fax_number": "872-804-2525"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "TENACITY PSYCHOLOGICAL SERVICES, LLC",
        "organizational_subpart": "NO",
        "enumeration_date": "2019-04-19",
        "last_updated": "2026-02-06",
        "certification_date": "2026-02-06",
        "status": "A",
        "authorized_official_last_name": "MILLER",
        "authorized_official_first_name": "JOSIAH",
        "authorized_official_middle_name": "JAMES",
        "authorized_official_title_or_position": "OWNER",
        "authorized_official_telephone_number": "872-808-0285",
        "authorized_official_name_prefix": "Dr.",
        "authorized_official_credential": "PSYD"
    },
    "taxonomies": [
        {
            "code": "103T00000X",
            "taxonomy_group": "",
            "desc": "Psychologist",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "103TC0700X",
            "taxonomy_group": "",
            "desc": "Psychologist, Clinical",
            "state": null,
            "license": null,
            "primary": true
        },
        {
            "code": "103TC1900X",
            "taxonomy_group": "",
            "desc": "Psychologist, Counseling",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "103TC2200X",
            "taxonomy_group": "",
            "desc": "Psychologist, Clinical Child & Adolescent",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "103TF0000X",
            "taxonomy_group": "",
            "desc": "Psychologist, Family",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "103TH0100X",
            "taxonomy_group": "",
            "desc": "Psychologist, Health Service",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "103TP2701X",
            "taxonomy_group": "",
            "desc": "Psychologist, Group Psychotherapy",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "261QM0801X",
            "taxonomy_group": "",
            "desc": "Clinic/Center, Mental Health (Including Community Mental Health Center)",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "103TH0004X",
            "taxonomy_group": "",
            "desc": "Psychologist, Health",
            "state": null,
            "license": null,
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "523478244001",
            "state": "IL"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Chicago, IL

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 6, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
  • National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.