Mark J. Sebastian, DMD

Dentist · Federal Way, WA

Individual Active NPI

NPI number 1477536027

Practice location

33516 9TH Ave S
Westhill Court Bldg 2
Federal Way, WA 98003-6322
Phone
(253) 941-6242
Fax
(253) 952-2129

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NPI record

NPI
1477536027
Entity type
Individual (Type 1)
Enumeration date
November 28, 2005
Last updated
July 13, 2026
Sole proprietor
No

Specialties & taxonomy codes

TaxonomyCodeLicenseState
Dentist Primary 122300000X 5374 WA

About Dr. Sebastian

Mark J. Sebastian, DMD is a healthcare provider registered in the NPI registry with the primary taxonomy Dentist (code 122300000X). The practice location is 33516 9TH Ave S, Westhill Court Bldg 2, Federal Way, WA 98003-6322. The NPI number 1477536027 was assigned on November 28, 2005 and the record was last updated on July 13, 2026.

Dr. Sebastian lists a license in the registry: #5374 (WA) for Dentist. License numbers are self-reported to NPPES; verify them with the state licensing board.

Frequently asked questions

What is the NPI number of Mark J. Sebastian, DMD?

The NPI number is 1477536027.

What is the phone number of Dr. Sebastian?

The phone number listed for the practice location is (253) 941-6242.

Where is Dr. Sebastian located?

33516 9TH Ave S, Westhill Court Bldg 2, Federal Way, WA 98003-6322.

What is the taxonomy code for Dr. Sebastian?

The primary taxonomy code is 122300000X – Dentist.

Is this information correct?

All details come from the public NPPES registry. Providers can update their record at nppes.cms.hhs.gov; changes appear here after the next weekly update.

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