Katharine Marshall, MD
NPI 1891143327 · Addiction Medicine (Internal Medicine) Physician · Portland, OR
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katharine Marshall, MD is a Addiction Medicine (Internal Medicine) Physician provider in Portland, OR (NPI 1891143327).
Provider details
- NPI number
- 1891143327
- Entity type
- Individual
- Primary specialty
- Addiction Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD194144 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Buprenorphine Hcl/Naloxone Hclbrand: Buprenorphine-Naloxone | 272 | 113 |
| Buprenorphine Hcl | 54 | 22 |
| Naltrexone Hcl | 41 | 23 |
| Acamprosate Calcium | 18 | 12 |
| Naloxone Hcl | 16 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (2)
- 3181 Sw Sam Jackson Park RdPortland, OR 97239-3011Phone: (503) 494-8562Fax: (503) 418-5505
- 9205 Sw Barnes RdSte Mt2800Portland, OR 97225Phone: (503) 216-2621
Registry dates
- Enumerated
- 2016-05-25
- Last updated
- 2026-01-14
- Certified
- 2026-01-14
Frequently asked questions
- What is Katharine Marshall's NPI number?
- Katharine Marshall's National Provider Identifier (NPI) is 1891143327, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katharine Marshall's specialty?
- Katharine Marshall is listed in the NPPES registry with a primary specialty of Addiction Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Katharine Marshall located?
- Katharine Marshall's practice location on file with NPPES is 3500 N Interstate Ave, Portland, OR 97227-1196.
- What is Katharine Marshall's phone number?
- The practice phone number listed in the NPPES registry for Katharine Marshall is (800) 813-2000.
- Does Katharine Marshall accept Medicare?
- Katharine Marshall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katharine Marshall's NPI active?
- Yes — Katharine Marshall's NPI (1891143327) is active in the NPPES registry as of the last update on 2026-01-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.