1. Home
  2. Directory
  3. Illinois
  4. Chicago
  5. Psychologist
  6. NPI Profile

TENACITY PSYCHOLOGICAL SERVICES, LLC
NPI 1619530185
Psychologist - Clinical in Chicago, IL

Active since April 19, 2019
8 S MICHIGAN AVE STE 1500, CHICAGO, IL 60603(872) 808-0285(872) 804-2525 Get Directions Write a Review

NPPES record last updated: February 6, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Feb 6, 2026, Feb 27, 2023, Apr 20, 2021 and 3 more (6 updates tracked since 2019).

About Tenacity Psychological Services, Llc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

TENACITY PSYCHOLOGICAL SERVICES, LLC (NPI 1619530185) is a healthcare organization registered as a clinical in Chicago, Illinois and active in the NPI registry since April 2019. The organization lists Josiah James Miller, Owner, as its authorized official.

NPPES Registry Identity

NPI1619530185
Entity TypeOrganization
Primary Taxonomy103TC0700X
Legal Business NameTENACITY PSYCHOLOGICAL SERVICES, LLC
Location Address8 S MICHIGAN AVE STE 1500Chicago, IL 60603-3362
Mailing Address8 S Michigan Ave Ste 1500Chicago, IL 60603-3362 · (872) 808-0285 · Fax (872) 804-2525
Phone(872) 808-0285
Fax(872) 804-2525
Organization SubpartNo
Authorized OfficialJosiah James MillerOwner · (872) 808-0285
Enumeration DateApril 19, 2019
Last NPPES UpdateFebruary 6, 20266 updates tracked since enumeration
NPPES CertifiedFebruary 6, 2026
✔ NPI 1619530185 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 9

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
Definition
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.
Also ListedPsychologistTaxonomy 103T00000X
Also ListedPsychologist · CounselingTaxonomy 103TC1900X
Also ListedPsychologist · Clinical Child & AdolescentTaxonomy 103TC2200X
Also ListedPsychologist · FamilyTaxonomy 103TF0000X
Also ListedPsychologist · HealthTaxonomy 103TH0004X
Also ListedPsychologist · Health ServiceTaxonomy 103TH0100X
Also ListedPsychologist · Group PsychotherapyTaxonomy 103TP2701X
Also ListedClinic/Center · Mental Health (Including Community Mental Health Center)Taxonomy 261QM0801X
8 S MICHIGAN AVE STE 1500, Chicago, IL 60603
Open in Google Maps ↗

Other Identifiers 1

Medicaid523478244001IL

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Tenacity Psychological Services, Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Tenacity Psychological Services, LLC, which bills Medicare for the services they deliver. Of these, 1 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Josiah Miller, PSYD
Clinical Psychologist
NPI 1023521200
8 S MICHIGAN AVE STE 1500
Chicago, IL 60603
(872) 808-0285
✔ PECOS✔ Accepts Medicare0.7 mi
Mary Ann Andrade-Bekker, LCPC
Mental Health Counselor
NPI 1922498690
600 S WASHINGTON ST STE 105
Naperville, IL 60540
(630) 206-4060
✔ PECOS✔ Accepts Medicare28 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Tenacity Psychological Services, LLC's NPI number?

The NPI number for Tenacity Psychological Services, LLC is 1619530185. It was assigned to this organization in the NPPES registry on April 19, 2019.

Where is Tenacity Psychological Services, LLC located?

Tenacity Psychological Services, LLC is located at 8 S Michigan Ave Ste 1500, Chicago, IL 60603. The listed phone number is (872) 808-0285.

What is Tenacity Psychological Services, LLC's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is Tenacity Psychological Services, LLC enrolled in Medicare?

Yes. Tenacity Psychological Services, LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Tenacity Psychological Services, LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Tenacity Psychological Services, LLC, in Clinical Psychologist and Mental Health Counselor. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 1 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Tenacity Psychological Services, LLC was last updated on February 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.