Quick answers
- Where does Dena Z. Olwan see patients?
- Medicare's clinician data lists 1 practice location in Sioux City, IA. Call before your visit to confirm the address.
- What is Dena Z. Olwan's specialty?
- Medicare lists Clinical Psychologist as the primary specialty.
- Does Dena Z. Olwan accept Medicare assignment?
- Medicare's clinician data says Dena Z. Olwan may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Dena Z. Olwan's NPI number?
- 1588648596. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Dena Z. Olwan is enrolled with Medicare (CMS data updated 2026-10-02).
- 401 Douglas St, Suite 504Sioux City, IA 51101
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Sioux City
Clinicians with the same Medicare primary specialty in Sioux City, IA — not a recommendation.
Clinician information
| Graduation year | 1992 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1588648596 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians