Dena Witthaus, D.O.
NPI 1528354966 · Internal Medicine Physician · Portland, OR
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dena Witthaus, D.O. is a Internal Medicine Physician provider in Portland, OR (NPI 1528354966).
Provider details
- NPI number
- 1528354966
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- Yes
- License
- PG154631 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 117 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 333 | 103 |
| Lisinopril | 254 | 87 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 248 | 70 |
| Oxycodone Hcl | 227 | 69 |
| Losartan Potassium | 225 | 78 |
| Levothyroxine Sodium | 219 | 65 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-06-23
- Last updated
- 2025-08-27
- Certified
- 2025-08-27
Frequently asked questions
- What is Dena Witthaus's NPI number?
- Dena Witthaus's National Provider Identifier (NPI) is 1528354966, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dena Witthaus's specialty?
- Dena Witthaus is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Dena Witthaus located?
- Dena Witthaus's practice location on file with NPPES is 19500 Se Stark St, Portland, OR 97233-5757.
- What is Dena Witthaus's phone number?
- The practice phone number listed in the NPPES registry for Dena Witthaus is (800) 813-2000.
- Does Dena Witthaus accept Medicare?
- Dena Witthaus is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dena Witthaus's NPI active?
- Yes — Dena Witthaus's NPI (1528354966) is active in the NPPES registry as of the last update on 2025-08-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.