Susan Lee Masonis, MD
Internal Medicine Physician · Seattle, WA
Susan Lee Masonis, MD is an internal medicine physician with a practice address in Seattle, Washington, and NPI 1124244207, issued on Apr 18, 2007. Check the license (Washington MD00044807, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Susan Lee Masonis
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD00044807 WA
Self-reported in NPPES; status is on the state search - Practice location
- 747 Broadway, Seattle, WA 98122
- Phone
- (206) 386-2202
- Enumerated
- Apr 18, 2007
- Record last updated
- Apr 27, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20060303000206); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 2001
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Also registered at 747 Broadway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Susan Lee Masonis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00044807Check 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
59 Medicare Part D claims for 12 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
- Kaiser Foundation Health Plan OF WashingtonSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Susan Lee Masonis among 3,079 internal medicine physician records in Washington
Susan Lee Masonis, MD is one of 3,079 internal medicine physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2001 · median 2006 among the 1,852 with a school on file
- Record last updated2021 · 63% 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 Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
821 internal medicine physician records list a practice address in Seattle
They are 821 of the 41,956 NPPES records with a practice address in Seattle, and 3,079 internal medicine physician records in Washington.
All 3,079 in Washington → Every provider in Seattle → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kenji Asakura, MDSeattle, WA 981221538179965
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- J Brodsky, MDSeattle, WA 981221073532859
- Bennett Burke, MDSeattle, WA 981221821171851
- Edward Chun, M.D.Seattle, WA 981221639150436
- Joseph Denor, MDSeattle, WA 981221679548531
- Peggy Eaton, M.D.Seattle, WA 981221326001918
Common questions
What is Susan Lee Masonis, MD's NPI number?
Susan Lee Masonis, MD's National Provider Identifier (NPI) is 1124244207, issued on Apr 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Susan Lee Masonis, MD located?
The NPPES record lists a practice address at 747 Broadway, Seattle, WA, 98122. Phone: (206) 386-2202. Providers update this record themselves, so call before visiting.
How can I verify Susan Lee Masonis, MD's license?
NPPES lists Washington license number MD00044807, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Susan Lee Masonis, MD prescribe under Medicare Part D?
In 2024, Susan Lee Masonis, MD had 59 Medicare Part D claims for 12 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.