DENA WITTHAUS D.O.
NPI 1528354966
Internal Medicine in Portland, OR
About Dena Witthaus D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DENA WITTHAUS D.O. (NPI 1528354966) is an individual internal medicine provider in Portland, Oregon, licensed in Oregon (DO166704) and active in the NPI registry since June 2011. She is enrolled in Medicare PECOS and is a graduate of Arizona College Of Osteopathic Medicine Mid Western University (2011).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dena Witthaus D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Dena Witthaus reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Gresham, OR 97030
- Reassigned Medicare billing, Oregon and Washington enrollments
- Medicare enrollment name: Kaiser Foundation Health Plan Of The Northwest
- Also billed through NPI 1871848457 (Washington)
- 3,207 clinicians in this Medicare group
Albany, OR 97321
- Reassigned Medicare billing, Oregon enrollment
- 432 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 97233 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PORTLAND, OR 97233
PORTLAND, OR 97233
PORTLAND, OR 97233
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Dena Witthaus's NPI number?
The NPI number for Dena Witthaus is 1528354966. It was assigned to this individual provider in the NPPES registry on June 23, 2011.
Where is Dena Witthaus located?
Dena Witthaus practices at 19500 SE Stark St, Portland, OR 97233. The listed phone number is (800) 813-2000.
What is Dena Witthaus's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Dena Witthaus enrolled in Medicare?
Yes. Dena Witthaus is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Dena Witthaus's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Dena Witthaus reassigns Medicare benefits to 2 organizations: Sapphire At Gresham Rehab, LLC (Gresham, OR) and Albany General Hospital (Albany, OR). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Dena Witthaus's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Dena Witthaus accept?
Health plans from Kaiser Permanente list Dena Witthaus as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Dena Witthaus was last updated on August 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dena Witthaus, D.O. · NPI 1528354966
Internal Medicine physician in Portland, Oregon. Individual provider, active in the CMS NPPES registry since June 23, 2011.
## Identity
- **NPI:** 1528354966 (Entity type: Individual)
- **Enumerated:** June 23, 2011
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** DO166704 (Oregon)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 19500 SE STARK ST, Portland, OR 97233-5757
- **Phone:** (800) 813-2000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Sapphire At Gresham Rehab, LLC (NPI 1033740899, Gresham, OR); Albany General Hospital (NPI 1609265123, Albany, OR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Arizona College Of Osteopathic Medicine Mid Western University, class of 2011
## Record status
- **NPPES last updated:** August 27, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1528354966) · Data from the CMS NPPES public registry.