Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mark J Sebastian, DMD

Individual provider Dentist · NPI 1477536027

Mark J Sebastian, DMD is a Dentist in Federal Way, Washington. Licensed in Washington. Registered with an NPI since 2005.

Licensed in
WA
In the registry since
2005
What do these letters mean?
DMD — Doctor of Dental Medicine
A dentist. Identical training and licensing to a DDS.

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Practice location Address checks out

33516 9th Ave S Westhill Ct Bldg 2
Federal Way, WA 98003-6322
Phone: (253) 941-6242
Fax: (253) 952-2129
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Dentist (primary) Taxonomy 122300000X · Licence 5374 (WA)

Record details

NPI number1477536027
Entity typeIndividual (Type 1)
GenderMale
Credentials DMD
Sole proprietorNo
NPI enumeratedNovember 28, 2005
Last updated in NPPESJuly 13, 2026
Mailing address33516 9th Ave S, Westhill Court Bldg 2, Federal Way, WA 98003-6322

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