Gwen Johanna Grewe, M.D.
Internal Medicine Physician · Tualatin, OR
Gwen Johanna Grewe, M.D. is an internal medicine physician with a practice address in Tualatin, Oregon, and NPI 1326014234, issued on Feb 28, 2006. Check the license (Oregon MD21373, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gwen Johanna Grewe
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD21373 OR
Self-reported in NPPES; status is on the state search - Practice location
- 19875 SW 65TH Ave, Tualatin, OR 97062
- Phone
- (503) 692-7785
- Enumerated
- Feb 28, 2006
- Record last updated
- Feb 18, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (503) 885-1663
- Medicaid ID
- 288449 OR
- Medicare enrollment
- Enrolled (PECOS I20101101000210); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,116 in Oregon → Look up another NPI →
Also registered at 19875 SW 65TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gwen Johanna Grewe in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD21373Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
34% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,082 Medicare Part D claims for 147 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
Most prescribed
- Levothyroxine Sodium147 claims
- Losartan Potassium131 claims
- Amlodipine Besylate117 claims
- Hydrochlorothiazide113 claims
- Lisinopril99 claims
- Atorvastatin Calcium98 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
- Legacy Meridian Park HospitalTualatin, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gwen Johanna Grewe among 2,116 internal medicine physician records in Oregon
Gwen Johanna Grewe, M.D. is one of 2,116 internal medicine physician records with a practice address in Oregon. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 54% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1997 · median 2008 among the 1,232 with a school on file
- Record last updated2011 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
44 internal medicine physician records list a practice address in Tualatin
They are 44 of the 863 NPPES records with a practice address in Tualatin, and 2,116 internal medicine physician records in Oregon.
All 2,116 in Oregon → Every provider in Tualatin → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Tammi Boston, MDTualatin, OR 970621033184593
- Jaymee Delaney, MDTualatin, OR 970621003864687
- John Forsythe, MDTualatin, OR 970621134188386
- Jeffrey Fullman, MDTualatin, OR 970621932178951
- Tana Haynes, M.D.Tualatin, OR 970621639160369
- Mark McKinstry, MDTualatin, OR 970621073582383
- Suzanne Migchelbrink, MDTualatin, OR 970621174592190
- David Nazemi, MDTualatin, OR 970621457329286
Common questions
What is Gwen Johanna Grewe, M.D.'s NPI number?
Gwen Johanna Grewe, M.D.'s National Provider Identifier (NPI) is 1326014234, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gwen Johanna Grewe, M.D. located?
The NPPES record lists a practice address at 19875 SW 65TH Ave, Tualatin, OR, 97062. Phone: (503) 692-7785. Providers update this record themselves, so call before visiting.
How can I verify Gwen Johanna Grewe, M.D.'s license?
NPPES lists Oregon license number MD21373, 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 Gwen Johanna Grewe, M.D. prescribe under Medicare Part D?
In 2024, Gwen Johanna Grewe, M.D. had 2,082 Medicare Part D claims for 147 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.