Active NPI
Tenacity Psychological Services, LLC
- Clinical Psychologist
- Chicago, IL
National Provider Identifier
1619530185
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Clinical Psychologist
- 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, 2026
- Organization subpart
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Authorized official
- Name
- Dr. Josiah James Miller, PSYD
- 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) | Code | License | State | Primary |
|---|---|---|---|---|
| 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
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 523478244001 | Medicaid | IL |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in IL
Enrollment records 1
National Provider Directory
National Provider DirectoryLocations
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.
-
- Clinical Psychologist
- Chicago, IL
- NPI 1023521200
-
- Professional Counselor
- Naperville, IL
- NPI 1922498690
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": []
}
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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.