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

Dr. Dena Z Olwan, PHD

Individual provider Clinical Psychologist · NPI 1588648596

Dr. Dena Z Olwan, PHD is a Clinical Psychologist in Sioux City, Iowa. Qualified in 1992, 34 years ago. Practices as a sole proprietor. Licensed in Iowa.

Years since qualifying
34
Licensed in
IA
In the registry since
2005
Specialties on file
2
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

401 Douglas St Ste 504
Sioux City, IA 51104-1471
Phone: (712) 258-1000
Fax: (712) 252-1100
Show map & directions

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

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 00703 (IA)
Clinical Psychologist Taxonomy 103TC0700X · Licence 00703 (IA)

Record details

NPI number1588648596
Entity typeIndividual (Type 1)
GenderFemale
Credentials PHD
Sole proprietorYes
NPI enumeratedDecember 2, 2005
Last updated in NPPESAugust 1, 2021
Certification dateAugust 1, 2021
Mailing address401 Douglas St Ste 504, Sioux City, IA 51101-1471

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1992 (34 years in practice)
Accepts Medicare assignment Not indicated

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