Margaret Mass MD
About this NPIWhat this record shows.
NPI 1083343107 is registered to Margaret Mass MD, a Family Medicine practising at 904 7th Ave in Seattle, Washington. Family Medicine physicians provide comprehensive primary care for patients of all ages, including preventive care, chronic disease management, and acute illness treatment. Margaret Mass MD has been enumerated in the National Provider Identifier (NPI) registry since 2022.
Your brand here.
Medicare enrollment
This provider holds a Medicare enrollment on file with the Provider Enrollment, Chain and Ownership System (PECOS). Each enrollment carries a public Medicare Enrollment ID (ENRLMT_ID) used by billers and intermediaries.
Practitioner
- I20251001000186Family PracticeWA
Source: CMS PECOS public enrollment file.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Margaret Mass MD accepts. To confirm in-network status with your specific health plan, contact Margaret Mass MD directly at (206) 860-4700.
Frequently asked
Yes. NPI 1083343107 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Family Medicine physicians provide comprehensive primary care for patients of all ages, including preventive care, chronic disease management, and acute illness treatment.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (206) 860-4700.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Margaret Mass MD is a Type-1 individual NPI.