Katharine M. Mason-Ellis, PA-C
Physician Assistant · Clackamas, OR
Katharine M. Mason-Ellis, PA-C is a physician assistant with a practice address in Clackamas, Oregon, and NPI 1174047393, issued on Jul 30, 2017. Check the license (Oregon PA202574, as entered in NPPES) with the Oregon board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Katharine M. Mason-Ellis
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License numbers
- PA202574 OR
PA60779453 WA
Self-reported in NPPES; status is on the state search - Practice location
- 10151 SE Sunnyside RD Ste 100, Clackamas, OR 97015
- Phone
- (503) 659-0880
- Enumerated
- Jul 30, 2017
- Record last updated
- Apr 28, 2025
- Fax
- (503) 513-7425
- Medicare enrollment
- Enrolled (PECOS I20210409001581); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 2,094 in Oregon → Look up another NPI →
Also registered at 10151 SE Sunnyside RD Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Andrew Bitney, DOFamily Medicine Physician1154815983
- Shuowen Chen, MDFamily Medicine Physician1083118053
- Emily Cheslik, RDRegistered Dietitian1134791726
- Colleen Freeman, LCSWClinical Social Worker1396157814
- Romy Hafner, APRN-CNPFamily Nurse Practitioner1598191215
- Chelsea Jordan, RD, CDCESObesity and Weight Management Nutrition Registered Dietitian1023655826
Verify Katharine M. Mason-Ellis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Oregon board licenses this profession
Search for license PA202574Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average physician assistant in 2024
1,838 Medicare Part D claims for 470 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims.
Most prescribed
- Eliquis237 claims
- Metoprolol Succinate172 claims
- Atorvastatin Calcium130 claims
- Furosemide108 claims
- Ezetimibe100 claims
- Rosuvastatin Calcium97 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Portland Adventist Medical CenterPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katharine M. Mason-Ellis among 2,094 physician assistant records in Oregon
Katharine M. Mason-Ellis, PA-C is one of 2,094 physician assistant records with a practice address in Oregon. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 53% of them.
- NPI issued2017 · 53% of these records are older, 44% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2017 · median 2017 among the 1,552 with a school on file
- Record last updated2025 · 37% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
39 physician assistant records list a practice address in Clackamas
They are 39 of the 2,098 NPPES records with a practice address in Clackamas, and 2,094 physician assistant records in Oregon.
All 2,094 in Oregon → Every provider in Clackamas → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Adrian Choate, PAClackamas, OR 970151881700821
- Matthew Clark, PA-CClackamas, OR 970151073520581
- Howard Ferguson, PACClackamas, OR 970151174638514
- Stephen Godsil, PAClackamas, OR 970151144357161
- Heidi Kelbar, PA-CClackamas, OR 970151285884114
- Douglas Keller, PA-CClackamas, OR 970151225227531
- Katy Kwan, PA-CClackamas, OR 970151245569151
- Leonard Leimbach, PAHappy Valley, OR 970151073884854
Common questions
What is Katharine M. Mason-Ellis, PA-C's NPI number?
Katharine M. Mason-Ellis, PA-C's National Provider Identifier (NPI) is 1174047393, issued on Jul 30, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Katharine M. Mason-Ellis, PA-C located?
The NPPES record lists a practice address at 10151 SE Sunnyside RD Ste 100, Clackamas, OR, 97015. Phone: (503) 659-0880. Providers update this record themselves, so call before visiting.
How can I verify Katharine M. Mason-Ellis, PA-C's license?
NPPES lists Oregon license number PA202574, as entered by the provider. Search the Oregon board that licenses this profession; the NPPES record confirms identity only.
How much does Katharine M. Mason-Ellis, PA-C prescribe under Medicare Part D?
In 2024, Katharine M. Mason-Ellis, PA-C had 1,838 Medicare Part D claims for 470 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Katharine M. Mason-Ellis, PA-C's MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.