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

Lydia Ann Williams, PHD

Individual provider Clinical Psychologist · NPI 1184721110

Lydia Ann Williams, PHD is a Clinical Psychologist in Mount Vernon, Illinois. Qualified in 1995, 31 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
31
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

4230 Lincolnshire Dr Ste E
Mount Vernon, IL 62864-2189
Phone: (618) 242-4205
Fax: (618) 242-4209
Show map & directions

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

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 071005322 (IL)

Record details

NPI number1184721110
Entity typeIndividual (Type 1)
GenderFemale
Credentials PHD
Sole proprietorYes
NPI enumeratedSeptember 20, 2006
Last updated in NPPESJanuary 1, 2013
Mailing address4230 Lincolnshire Dr, Suite E, Mount Vernon, IL 62864-2189

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1995 (31 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare