Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MS. MARY LOU PETTY MSW LCSW
NPI 1598747461
Social Worker - Clinical in Chicago, IL

Active since November 16, 2005
30 N MICHIGAN AVE, STE 1004, CHICAGO, IL 60602(312) 236-4364 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Ms. Mary Lou Petty Msw Lcsw NPPES

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

MS. MARY LOU PETTY MSW LCSW (NPI 1598747461) is an individual clinical provider in Chicago, Illinois and active in the NPI registry since November 2005.

NPPES Registry Identity

NPI1598747461
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMS. MARY LOU PETTYCredential: MSW LCSW
Location Address30 N MICHIGAN AVE, STE 1004Chicago, IL 60602-3402
Mailing Address30 N Michigan Ave, Ste 1004Chicago, IL 60602-3402 · (312) 236-4364
Sole ProprietorNo
Enumeration DateNovember 16, 2005
Last NPPES UpdateJuly 13, 2026
NPI 1598747461 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
30 N MICHIGAN AVE, Chicago, IL 60602

Other Names 1

Other Name (5)Mary Lou Trezise

Other Identifiers 4

Other0005983663Aetna
Other190629Value Options
Other5906676720United Behavioral Health
Other01673624IL · Bcbs

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Dentist (General Practice)
30 N MICHIGAN AVE, SUITE 1329
CHICAGO, IL 60602
Allergy & Immunology
30 N MICHIGAN AVE, #1107
CHICAGO, IL 60602
Psychologist (Clinical)
30 N MICHIGAN AVE, SUITE 1703
CHICAGO, IL 60602
Social Worker (Clinical)
30 N MICHIGAN AVE, SUITE 1518
CHICAGO, IL 60602
Dentist (General Practice)
30 N MICHIGAN AVE, SUITE #1506
CHICAGO, IL 60602
Counselor (Professional)
30 N MICHIGAN AVE, SUITE 1002
CHICAGO, IL 60602
Psychologist (Clinical)
30 N MICHIGAN AVE, SUITE 1203
CHICAGO, IL 60602
Counselor (Professional)
30 N MICHIGAN AVE, SUITE 424
CHICAGO, IL 60602

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 Mary Lou Petty's NPI number?

The NPI number for Mary Lou Petty is 1598747461. It was assigned to this individual provider in the NPPES registry on November 16, 2005. The provider is also known as Mary Lou Trezise.

Where is Mary Lou Petty located?

Mary Lou Petty practices at 30 N Michigan Ave Ste 1004, Chicago, IL 60602. The listed phone number is (312) 236-4364.

What is Mary Lou Petty's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

When was this NPI record last updated?

The NPPES record for Mary Lou Petty was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 36 days 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.