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

Mark S Sadler, PHD

Individual provider Counseling Psychologist · NPI 1164535167

Mark S Sadler, PHD is a Counseling Psychologist in Tulsa, Oklahoma. Licensed in Oklahoma. Registered with an NPI since 2006.

Licensed in
OK
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

4520 S Harvard Ave Ste 200C
Tulsa, OK 74135-2925
Phone: (918) 743-3224
Fax: (918) 743-9623
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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 411 (OK)

Record details

NPI number1164535167
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedAugust 16, 2006
Last updated in NPPESSeptember 11, 2019
Mailing address4520 S Harvard Ave Ste 200c, Tulsa, OK 74135-2925

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