Active NPI
Mark J Sebastian, DMD
- Dentist
- Federal Way, WA
National Provider Identifier
1477536027
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Dentist
- License
- 5374
- Practice address
- 33516 9TH Ave S
Westhill Court BLDG 2
Federal Way, WA 98003-6322 - Phone
- (253) 941-6242
- Fax
- (253) 952-2129
- NPI assigned
- Nov 28, 2005
- Sex
- Male
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Dentist | 122300000X | 5374 | WA | Primary |
Addresses
Primary practice location
33516 9TH Ave S
Westhill Court BLDG 2
Federal Way, WA 98003-6322
Mailing address
33516 9TH Ave S
Westhill Court BLDG 2
Federal Way, WA 98003-6322
Phone (253) 941-6242
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 0040673 | Other | WA | LABOR & INDUSTRIES |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in WA
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: No
- Hospice: Yes
Enrollment records 1
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20150629002220 | WA | Order and Referring Only - Oral Surgery | 1153633441 |
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 5374 | WA | MD | Physical Therapist |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1133136000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1477536027",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "33516 9TH AVE S",
"address_2": "WESTHILL COURT BLDG 2",
"city": "FEDERAL WAY",
"state": "WA",
"postal_code": "980036322",
"telephone_number": "253-941-6242",
"fax_number": "253-952-2129"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "33516 9TH AVE S",
"address_2": "WESTHILL COURT BLDG 2",
"city": "FEDERAL WAY",
"state": "WA",
"postal_code": "980036322",
"telephone_number": "253-941-6242",
"fax_number": "253-952-2129"
}
],
"practiceLocations": [],
"basic": {
"last_name": "SEBASTIAN",
"first_name": "MARK",
"middle_name": "J",
"credential": "DMD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2005-11-28",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "122300000X",
"taxonomy_group": "",
"desc": "Dentist",
"state": "WA",
"license": "5374",
"primary": true
}
],
"identifiers": [
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "LABOR & INDUSTRIES",
"identifier": "0040673",
"state": "WA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Federal Way, WA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.