Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

MARILYN WILLIAMS
NPI 1689598120
Counselor - Mental Health in Oak Lawn, IL

Q: What is Marilyn Williams's NPI number?

The NPI number for Marilyn Williams is 1689598120. It was assigned to this individual provider in the NPPES registry on August 6, 2026.

Q: What is Marilyn Williams's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

Q: When was this NPI record last updated?

The NPPES record for Marilyn Williams was last updated on August 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.

Active since August 06, 2026

9249 S CICERO AVE UNIT 909, OAK LAWN, IL 60454(708) 581-8480 Get Directions Write a Review

NPPES record added: August 11, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

Record update history: Aug 11, 2026, Aug 6, 2026 (2 updates tracked since 2026).

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About Marilyn Williams NPPES

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

MARILYN WILLIAMS (NPI 1689598120) is an individual mental health provider in Oak Lawn, Illinois and active in the NPI registry since August 2026.

NPPES Registry Identity

NPI1689598120

Entity TypeIndividualFemale

Primary Taxonomy101YM0800X

Provider Legal NameMARILYN WILLIAMS

Location Address9249 S CICERO AVE UNIT 909Oak Lawn, IL 60454-4941

Mailing Address9249 S Cicero Ave Unit 909Oak Lawn, IL 60454-4941 · (708) 581-8480

Phone(708) 581-8480

Sole ProprietorNo

Enumeration DateAugust 6, 2026

Last NPPES UpdateAugust 11, 20262 updates tracked since enumeration

NPPES CertifiedAugust 11, 2026

✔ NPI 1689598120 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers

Taxonomy Code101YM0800X

9249 S CICERO AVE UNIT 909, Oak Lawn, IL 60454

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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 Marilyn Williams's NPI number?

The NPI number for Marilyn Williams is 1689598120. It was assigned to this individual provider in the NPPES registry on August 6, 2026.

Where is Marilyn Williams located?

Marilyn Williams practices at 9249 S Cicero Ave Unit 909, Oak Lawn, IL 60454. The listed phone number is (708) 581-8480.

What is Marilyn Williams's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

When was this NPI record last updated?

The NPPES record for Marilyn Williams was last updated on August 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.