Active NPI
Bryant Henry Mascarenas, MSW
- Social Worker
- Seattle, WA
National Provider Identifier
1831876085
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Social Worker
- License
- SC61544501
- Practice address
- 1600 S Lane St
Seattle, WA 98144-2810 - Phone
- (206) 682-2371
- NPI assigned
- Jun 29, 2023
- 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 |
|---|---|---|---|---|
| Social Worker | 104100000X | SC61544501 | WA | Primary |
Addresses
Primary practice location
1600 S Lane St
Seattle, WA 98144-2810
Mailing address
515 3Rd Ave
Seattle, WA 98104-2304
Phone (206) 464-1570
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| SC61544501 | WA | MD | Social Worker |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1687996800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1755648000000",
"number": "1831876085",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "515 3RD AVE",
"city": "SEATTLE",
"state": "WA",
"postal_code": "981042304",
"telephone_number": "206-464-1570",
"fax_number": "206-624-4196"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1600 S LANE ST",
"city": "SEATTLE",
"state": "WA",
"postal_code": "981442810",
"telephone_number": "206-682-2371"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MASCARENAS",
"first_name": "BRYANT",
"middle_name": "HENRY",
"credential": "MSW",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2023-06-29",
"last_updated": "2025-08-20",
"certification_date": "2025-08-20",
"status": "A"
},
"taxonomies": [
{
"code": "104100000X",
"taxonomy_group": "",
"desc": "Social Worker",
"state": "WA",
"license": "SC61544501",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Seattle, WA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 20, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.