Diane H. Williams, DO
Gastroenterology Physician · Portland, OR
Diane H. Williams, DO is a gastroenterology physician with a practice address in Portland, Oregon, and NPI 1619973351, issued on Jun 27, 2005. Check the license (Oregon DO15375, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Diane H. Williams
- Credential
- DO
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- DO15375 OR
Self-reported in NPPES; status is on the state search - Practice location
- 9701 SW Barnes RD, Portland, OR 97225
- Phone
- (503) 297-8081
- Enumerated
- Jun 27, 2005
- Record last updated
- Nov 28, 2023
- Fax
- (503) 292-6601
- Medicaid IDs
- 196642 OR
8126294 WA - Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 281 in Oregon → Look up another NPI →
Also registered at 9701 SW Barnes RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vesna Ader, PA-CMedical Physician Assistant1467528398
- Suzanne Adlesich, RNHigh-Risk Obstetric Registered Nurse1376479154
- Philip Alexander, MDVascular Surgery Physician1386640688
- Anna Anderson, PMHNPPsychiatric/Mental Health Nurse Practitioner1578601696
- Patrick Birbeck, PACMedical Physician Assistant1851397400
- Amy Caine, PA-CMedical Physician Assistant1558307678
Verify Diane H. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license DO15375Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average gastroenterology physician in 2024
125 Medicare Part D claims for 52 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Famotidine24 claims
- Pantoprazole Sodium21 claims
- Dicyclomine Hcl16 claims
- Omeprazole11 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.
Diane H. Williams among 281 gastroenterology physician records in Oregon
Diane H. Williams, DO is one of 281 gastroenterology physician records with a practice address in Oregon. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 80% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2023 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Oregon
There are 281 gastroenterology physician records in Oregon.
All 281 in Oregon → Every provider in Portland → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Christopher Carter, MDPortland, OR 972251003814799
- Glenn Eisen, MDPortland, OR 972251295741759
- David Grunkemeier, MDPortland, OR 972251972542090
- Larry Heinonen, MDPortland, OR 972251669478343
- John Jendrzejewski, MDPortland, OR 972251225034911
- Alan Kaynard, MDPortland, OR 972251356347991
- George Koval, MDPortland, OR 972251093711715
- John Lobitz, MDPortland, OR 972251851397558
Common questions
What is Diane H. Williams, DO's NPI number?
Diane H. Williams, DO's National Provider Identifier (NPI) is 1619973351, issued on Jun 27, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Diane H. Williams, DO located?
The NPPES record lists a practice address at 9701 SW Barnes RD, Portland, OR, 97225. Phone: (503) 297-8081. Providers update this record themselves, so call before visiting.
How can I verify Diane H. Williams, DO's license?
NPPES lists Oregon license number DO15375, 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 Diane H. Williams, DO prescribe under Medicare Part D?
In 2024, Diane H. Williams, DO had 125 Medicare Part D claims for 52 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.