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

Dr. William C Petersen, PHD

Individual provider Counseling Psychologist · NPI 1124109400

Dr. William C Petersen, PHD is a Counseling Psychologist in Saint Louis, Missouri. Practices as a sole proprietor. Licensed in Missouri.

Licensed in
MO
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.

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Practice location Address checks out

5351 Delmar Blvd
Saint Louis, MO 63112-3146
Phone: (314) 877-0685
Fax: (314) 877-0553
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Counseling Psychologist (primary) Taxonomy 103TC1900X · Licence 01531 (MO)

Record details

NPI number1124109400
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedOctober 17, 2006
Last updated in NPPESJune 12, 2008

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