Katharine F. Marshall, MD
Addiction Medicine (Internal Medicine) Physician · Portland, OR
Katharine F. Marshall, MD is an addiction medicine (internal medicine) physician with a practice address in Portland, Oregon, and NPI 1891143327, issued on May 25, 2016. Check the license (Oregon MD194144, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Katharine F. Marshall
- Credential
- MD
- Primary taxonomy
- Addiction Medicine (Internal Medicine) Physician 207RA0401X
- License numbers
- MD194144 OR
PG189357 OR
Self-reported in NPPES; status is on the state search - Practice location
- 3500 N Interstate Ave, Portland, OR 97227
- Phone
- (800) 813-2000
- Enumerated
- May 25, 2016
- Record last updated
- Jan 14, 2026
- Medicare enrollment
- Enrolled (PECOS I20190815000907); accepts Medicare assignment
- Medical or professional school
- Oregon Health Sciences University School Of Medicine, 2016
- Entity
- Type 1 · individual
8 nearest addiction medicine (internal medicine) physician records → All 15 in Oregon → Look up another NPI →
Also registered at 3500 N Interstate Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Krystle Alligood, BCBA, LBABehavior Analyst1730536913
- Madalene Anderson, FNPFamily Nurse Practitioner1659485779
- Diane Bader, LCSWClinical Social Worker1700109717
- Alistair Bahar, M.D.Internal Medicine Physician1306918842
- Peggy Bradley Pearson, ANPAdult Health Nurse Practitioner1114106598
- Robert Buschman, P.A.Physician Assistant1750495776
Verify Katharine F. Marshall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD194144Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average addiction medicine (internal medicine) physician in 2024
498 Medicare Part D claims for 197 beneficiaries, against an average of 829 among the 401 providers of this specialty who prescribed in Part D.
Most prescribed
- Buprenorphine-Naloxone272 claims
- Buprenorphine Hcl54 claims
- Naltrexone Hcl41 claims
- Acamprosate Calcium18 claims
- Naloxone Hcl16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Kaiser Foundation Health Plan OF The NorthwestClackamas, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katharine F. Marshall among 15 addiction medicine (internal medicine) physician records in Oregon
Katharine F. Marshall, MD is one of 15 addiction medicine (internal medicine) physician records with a practice address in Oregon. 93% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 67% of them.
- NPI issued2016 · 67% of these records are older, 7% newer
- In a Medicare fileYes · 93% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Record last updated2026 · 33% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RA0401X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Addiction Medicine (Internal Medicine) Physician providers in Oregon
There are 15 addiction medicine (internal medicine) physician records in Oregon.
All 15 in Oregon → Every provider in Portland → Addiction Medicine (Internal Medicine) Physician nationwide →
The 8 addiction medicine (internal medicine) physician records with the nearest ZIP codes
- Sudheer Earanky, DOPortland, OR 972271184071896
- Sarah Leitz, M.DPortland, OR 972271306013776
- Ellen Mooney, DOPortland, OR 972271528417169
- Vern Williams, MDPortland, OR 972271619967577
- Sounak Misra, MDPortland, OR 972171831144872
- Linda Peng, M.D.Portland, OR 972391164953725
- Eleasa Sokolski, MDPortland, OR 972391871954701
- Wei-Teng YangPortland, OR 972391871932368
Common questions
What is Katharine F. Marshall, MD's NPI number?
Katharine F. Marshall, MD's National Provider Identifier (NPI) is 1891143327, issued on May 25, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Katharine F. Marshall, MD located?
The NPPES record lists a practice address at 3500 N Interstate Ave, Portland, OR, 97227. Phone: (800) 813-2000. Providers update this record themselves, so call before visiting.
How can I verify Katharine F. Marshall, MD's license?
NPPES lists Oregon license number MD194144, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katharine F. Marshall, MD prescribe under Medicare Part D?
In 2024, Katharine F. Marshall, MD had 498 Medicare Part D claims for 197 beneficiaries; the average among addiction medicine (internal medicine) physician prescribers was 829. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.