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

Dena Witthaus, DO

Individual provider Internal Medicine Physician · NPI 1528354966

Dena Witthaus, DO is an Internal Medicine in Portland, Oregon. Graduated from Arizona College of Osteopathic Medicine Mid Western University in 2011, 15 years ago. Practices with Kaiser Foundation Health Plan of the Northwest, a 1,811-clinician group and accepts Medicare assignment. Licensed in Oregon.

Years since qualifying
15
Trained at
Arizona College of Osteopathic Medicine Mid Western University
Licensed in
OR
In the registry since
2011
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

19500 SE Stark St
Portland, OR 97233-5757
Phone: (800) 813-2000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence DO166704 (OR)
Internal Medicine Physician Taxonomy 207R00000X · Licence PG154631 (OR)

Record details

NPI number1528354966
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorYes
NPI enumeratedJune 23, 2011
Last updated in NPPESAugust 27, 2025
Certification dateAugust 27, 2025
Mailing address500 Ne Multnomah St Ste 100, Portland, OR 97232-2031

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolARIZONA COLLEGE OF OSTEOPATHIC MEDICINE MID WESTERN UNIVERSITY
Graduated 2011 (15 years in practice)
Group practice Kaiser Foundation Health Plan Of The Northwest — 1811 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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