Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Donna Louise Massoth, DDS MSD PH D

Periodontics in Seattle, WA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1649214925

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Registry record

Entity type Individual (Type 1)

Name Donna Louise Massoth

Credential DDS MSD PH D

Sex Female

Practice address 4500 Sand Point Way Ne, #218, Seattle, WA, 98105

Phone (206) 524-3773

Fax (206) 526-7361

Enumeration date Jun 16, 2006

Last updated in NPPES Jul 13, 2026

Taxonomy & licenses

1223P0300X Periodontics Dental Providers · License DE00005905 (WA) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is NPI 1649214925 active?

Yes, as of the latest NPPES snapshot, NPI 1649214925 is active (record last updated 2026-07-13).

How do I verify Donna Massoth's NPI record?

Cross-check NPI 1649214925 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-13.