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
Mailing address30 Flower Ln, Jericho, NY 11753-2312