Mason C. Paas, MD
Internal Medicine Physician · Portland, OR
Mason C. Paas, MD is an internal medicine physician with a practice address in Portland, Oregon, and NPI 1386215986, issued on Jul 5, 2021. Check the license (Oregon MD225581, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mason C. Paas
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD225581 OR
Self-reported in NPPES; status is on the state search - Practice location
- 4805 NE Glisan St Ste BG12, Portland, OR 97213
- Phone
- (503) 215-2392
- Enumerated
- Jul 5, 2021
- Record last updated
- Dec 2, 2025
- Medicare enrollment
- Enrolled (PECOS I20251119004164); accepts Medicare assignment
- Medical or professional school
- University Of Kentucky College Of Medicine, 2022
- Entity
- Type 1 · individual
Also registered at 4805 NE Glisan St Ste BG12
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mason C. Paas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD225581Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
53 Medicare Part D claims for 19 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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
- Providence Health And Services OregonPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
889 internal medicine physician records list a practice address in Portland
They are 889 of the 42,088 NPPES records with a practice address in Portland, and 2,116 internal medicine physician records in Oregon.
All 889 in Portland → All 2,116 in Oregon → Every provider in Portland →
Other internal medicine physician records in Oregon
- Charmaine Clarisse Abalos, M.D.Medford, OR1700376050
- Soraya Abbassian, M.D.Portland, OR1225029184
- Mohamed Abdel Khalek, M.DRoseburg, OR1972687390
- Rand AbedalweliPortland, OR1265019996
- Robert Abernathy, M.D.Bend, OR1063433449
- Rebecca Abney, D.O.Portland, OR1881984748
- Mohamed Aboukhashan, MDMedford, OR1932350782
- Allison Abraham, D.O.Portland, OR1831488444
- Heidi Abreu Pacheco, M.DMount Angel, OR1669691721
- Hennie Abrio, MDRoseburg, OR1891925129
Common questions
What is Mason C. Paas, MD's NPI number?
Mason C. Paas, MD's National Provider Identifier (NPI) is 1386215986, issued on Jul 5, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Mason C. Paas, MD located?
The NPPES record lists a practice address at 4805 NE Glisan St Ste BG12, Portland, OR, 97213. Phone: (503) 215-2392. Providers update this record themselves, so call before visiting.
How can I verify Mason C. Paas, MD's license?
NPPES lists Oregon license number MD225581, 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 Mason C. Paas, MD prescribe under Medicare Part D?
In 2024, Mason C. Paas, MD had 53 Medicare Part D claims for 19 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.