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

Dr. Thomas A Mahan, PHD

Individual provider Marriage & Family Therapist · NPI 1508922147

Dr. Thomas A Mahan, PHD is a Marriage & Family Therapist in Naperville, Illinois. Licensed in Illinois. Registered with an NPI since 2006.

Licensed in
IL
In the registry since
2006
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Practice location Address checks out

124 S Webster St Ste 202
Naperville, IL 60540-5390
Phone: (630) 913-1627
Fax: (866) 850-1154
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Marriage & Family Therapist (primary) Taxonomy 106H00000X · Licence 166-000634 (IL)

Record details

NPI number1508922147
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedDecember 28, 2006
Last updated in NPPESOctober 27, 2009

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