Quick answers
- Where does Dena B. Witthaus see patients?
- Medicare's clinician data lists 2 practice locations, including Vancouver, WA and Portland, OR. Call before your visit to confirm the address.
- What is Dena B. Witthaus's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Dena B. Witthaus accept Medicare assignment?
- Yes. Medicare's clinician data says Dena B. Witthaus accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Dena B. Witthaus?
- (800) 813-2000, as listed in official Medicare / NPI Registry data.
- What is Dena B. Witthaus's NPI number?
- 1528354966. 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 B. Witthaus is enrolled with Medicare (CMS data updated 2026-10-02).
- 14406 NE 20th AveVancouver, WA 98686 (800) 813‑2000
- 19500 SE Stark StPortland, OR 97233 (800) 813‑2000
Group practices
Medicare enrollment lists Dena B. Witthaus as a member of this group (CMS data updated 2026-10-02).
- Kaiser Foundation Health Plan of the Northwest1,807 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Vancouver
Clinicians with the same Medicare primary specialty in Vancouver, WA — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Arizona College Of Osteopathic Medicine Mid Western University |
| Graduation year | 2011 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1528354966 |
| 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