Dena Z. Olwan, PHD
Psychologist · Sioux City, IA
Dena Z. Olwan, PHD is a psychologist with a practice address in Sioux City, Iowa, and NPI 1588648596, issued on Dec 2, 2005. Check the license (Iowa 00703, as entered in NPPES) with the Iowa board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Dena Z. Olwan
- Credential
- PHD
- Primary taxonomy
- Psychologist 103T00000X
- License number
- 00703 IA
Self-reported in NPPES; status is on the state search - Practice location
- 401 Douglas Street, Sioux City, IA 51104
- Phone
- (712) 258-1000
- Enumerated
- Dec 2, 2005
- Record last updated
- Aug 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (712) 252-1100
- Medicaid ID
- 2157180 IA
- Medicare enrollment
- Enrolled (PECOS I20041220000763); may accept Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychologist records → All 251 in Iowa → Look up another NPI →
Verify Dena Z. Olwan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Iowa board licenses this profession
Search for license 00703Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Dena Z. Olwan among 251 psychologist records in Iowa
Dena Z. Olwan, PHD is one of 251 psychologist records with a practice address in Iowa. 19% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileNo · 19% of these records are
- In the CMS Doctors and Clinicians fileYes · 27% of these records are
- Graduated1992 · median 2001 among the 68 with a school on file
- Record last updated2021 · 68% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103T00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychologist providers in Iowa
There are 251 psychologist records in Iowa. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 251 in Iowa → Every provider in Sioux City → Psychologist nationwide →
The 8 psychologist records with the nearest ZIP codes
- Brenda Crawford, PHDSioux City, IA 511041205188091
- Denise Marandola, PH.DSioux City, IA 511041376630277
- Genell Sandberg, PHDSioux City, IA 511041851375802
- Raul Sanchez, PH.DSioux City, IA 511061710068002
- Mary-Elizabeth Satterfield, EDD.,R.N.LSioux City, IA 511061215901939
- Annie Stachowitz, PH.D.Sioux City, IA 511061013416874
- Michael Baker, PHDSioux City, IA 511011760461321
- Breanne DanziSioux City, IA 511011154815959
Common questions
What is Dena Z. Olwan, PHD's NPI number?
Dena Z. Olwan, PHD's National Provider Identifier (NPI) is 1588648596, issued on Dec 2, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Dena Z. Olwan, PHD located?
The NPPES record lists a practice address at 401 Douglas Street, Sioux City, IA, 51104. Phone: (712) 258-1000. Providers update this record themselves, so call before visiting.
How can I verify Dena Z. Olwan, PHD's license?
NPPES lists Iowa license number 00703, as entered by the provider. Search the Iowa board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.