Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mari Mortensen, LCSW

Individual provider Clinical Social Worker · NPI 1578276770

Mari Mortensen, LCSW is a Clinical Social Worker in Darien, Illinois. Qualified in 1981, 45 years ago. Practices as a sole proprietor and accepts Medicare assignment.

Years since qualifying
45
In the registry since
2023
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

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Practice location Address checks out

9265 Waterfall Glen Blvd
Darien, IL 60561-5282
Phone: (708) 650-4356
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X

Record details

NPI number1578276770
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorYes
NPI enumeratedJanuary 3, 2023
Last updated in NPPESJuly 31, 2024
Certification dateJuly 31, 2024
Mailing address9265 Waterfall Glen Blvd, Darien, IL 60561-5282

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 1981 (45 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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