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

Dr. Douglas Lon William, PHD

Individual provider Clinical Child & Adolescent Psychologist · NPI 1871632489

Dr. Douglas Lon William, PHD is a Clinical Child & Adolescent Psychologist in Jericho, New York. Practices as a sole proprietor. Licensed in New York.

Licensed in
NY
In the registry since
2007
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

30 Flower Ln
Jericho, NY 11753-2312
Phone: (516) 931-0752
Show map & directions

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

Specialties & licences

Clinical Child & Adolescent Psychologist (primary) Taxonomy 103TC2200X · Licence 6159 (NY)

Record details

NPI number1871632489
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedFebruary 6, 2007
Last updated in NPPESJuly 8, 2007