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

Dr. William Douglas Pierce, PHD

Individual provider Clinical Psychologist · NPI 1205801727

Dr. William Douglas Pierce, PHD is a Clinical Psychologist in Yankton, South Dakota. Licensed in South Dakota. Registered with an NPI since 2006.

Licensed in
SD
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

1000 W 4th St
Yankton, SD 57078-3730
Phone: (605) 665-0258
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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 431 (SD)

Record details

NPI number1205801727
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedFebruary 19, 2006
Last updated in NPPESMay 23, 2011

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