Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark J Sebastian, DMD
Dentist in Federal Way, WA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1477536027
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Registry record
Entity type Individual (Type 1)
Name Mark J Sebastian
Credential DMD
Sex Male
Practice address 33516 9th Ave S, Westhill Court Bldg 2, Federal Way, WA, 98003
Phone (253) 941-6242
Fax (253) 952-2129
Enumeration date Nov 28, 2005
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees.
About the DMD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 0040673 | Other | WA | LABOR & INDUSTRIES |
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.
Frequently asked questions
Where does Mark Sebastian practice?
The practice location on file with NPPES is in Federal Way, WA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mark Sebastian?
The National Provider Identifier (NPI) for Mark Sebastian is 1477536027, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.