Susan Masonis, MD
NPI 1124244207 · Internal Medicine Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Susan Masonis, MD is a Internal Medicine Physician provider in Seattle, WA (NPI 1124244207).
Provider details
- NPI number
- 1124244207
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- MD00044807 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 925 Seneca StG2-GhcSeattle, WA 98101-2742Phone: (206) 341-0736
Registry dates
- Enumerated
- 2007-04-18
- Last updated
- 2021-04-27
- Certified
- 2021-04-27
Frequently asked questions
- What is Susan Masonis's NPI number?
- Susan Masonis's National Provider Identifier (NPI) is 1124244207, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Susan Masonis's specialty?
- Susan Masonis is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Susan Masonis located?
- Susan Masonis's practice location on file with NPPES is 747 Broadway, Seattle, WA 98122-4379.
- What is Susan Masonis's phone number?
- The practice phone number listed in the NPPES registry for Susan Masonis is (206) 386-2202.
- Does Susan Masonis accept Medicare?
- Susan Masonis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Susan Masonis's NPI active?
- Yes — Susan Masonis's NPI (1124244207) is active in the NPPES registry as of the last update on 2021-04-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.