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

Douglas B. Demerchant Psy D , LLC

Organization Clinical Psychologist · NPI 1548380405

Douglas B. Demerchant Psy D , LLC is a Clinical Psychologist in Wheaton, Illinois. Licensed in Illinois. Registered with an NPI since 2007.

Licensed in
IL
In the registry since
2007
What do these letters mean?
LLC — Limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

620 W Roosevelt Rd Ste D1
Wheaton, IL 60187-5086
Phone: (630) 462-1999
Fax: (630) 462-0069
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 071003669 (IL)

Record details

NPI number1548380405
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Douglas Demerchant — Owner · (630) 462-1999
NPI enumeratedApril 1, 2007
Last updated in NPPESJanuary 29, 2011
Mailing address620 W Roosevelt Rd, Suite D1, Wheaton, IL 60187-5086

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