Active NPI
Justin Otto Kastenhuber, LMSW
- Social Worker
- North Haven, CT
National Provider Identifier
1063383883
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Social Worker
- License
- 11509
- Practice address
- 271 Spring Rd
North Haven, CT 06473-3410 - Phone
- (203) 671-8188
- NPI assigned
- Sep 15, 2025
- Sex
- Male
- Sole proprietor
- Yes
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 | 11509 | CT | Primary |
Addresses
Primary practice location
271 Spring Rd
North Haven, CT 06473-3410
Mailing address
271 Spring Rd
North Haven, CT 06473-3410
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 |
|---|---|---|---|
| 11509 | CT | MD | Social Worker |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1757894400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757894400000",
"number": "1063383883",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "271 SPRING RD",
"city": "NORTH HAVEN",
"state": "CT",
"postal_code": "064733410"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "271 SPRING RD",
"city": "NORTH HAVEN",
"state": "CT",
"postal_code": "064733410",
"telephone_number": "203-671-8188"
}
],
"practiceLocations": [],
"basic": {
"last_name": "KASTENHUBER",
"first_name": "JUSTIN",
"middle_name": "OTTO",
"credential": "LMSW",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2025-09-15",
"last_updated": "2025-09-15",
"certification_date": "2025-09-15",
"status": "A"
},
"taxonomies": [
{
"code": "104100000X",
"taxonomy_group": "",
"desc": "Social Worker",
"state": "CT",
"license": "11509",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in North Haven, CT
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 15, 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.