Active NPI
Joyce Mierzejwski, LPC
- Mental Health Counselor
- Montclair, NJ
National Provider Identifier
1417013962
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Mental Health Counselor
- License
- PC0515
- Practice address
- 8 Hillside Ave Ste 107
Montclair, NJ 07042-2129 - Phone
- (973) 857-5333
- NPI assigned
- Dec 29, 2006
- Sex
- Female
- 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 |
|---|---|---|---|---|
| Mental Health Counselor | 101YM0800X | PC0515 | NJ | Primary |
Addresses
Primary practice location
8 Hillside Ave Ste 107
Montclair, NJ 07042-2129
Mailing address
7 Pierson PL
Glen Ridge, NJ 07028-1208
Phone (973) 857-5333
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 0515 | Other | NJ | LICENSE |
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 |
|---|---|---|---|
| PC0515 | NJ | MD | Mental Health Counselor |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| The Family Center at Montclair | Past | Accepting new patients |
Organizations & group practices 1
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Community/Behavioral Health Agency
- Montclair, NJ
- NPI 1912063462
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1167350400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1774310400000",
"number": "1417013962",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "7 PIERSON PL",
"city": "GLEN RIDGE",
"state": "NJ",
"postal_code": "070281208",
"telephone_number": "973-857-5333"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "8 HILLSIDE AVE STE 107",
"city": "MONTCLAIR",
"state": "NJ",
"postal_code": "070422129",
"telephone_number": "973-857-5333"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MIERZEJWSKI",
"first_name": "JOYCE",
"name_prefix": "Ms.",
"credential": "LPC",
"sole_proprietor": "YES",
"sex": "F",
"enumeration_date": "2006-12-29",
"last_updated": "2026-03-24",
"certification_date": "2026-03-24",
"status": "A"
},
"taxonomies": [
{
"code": "101YM0800X",
"taxonomy_group": "",
"desc": "Counselor, Mental Health",
"state": "NJ",
"license": "PC0515",
"primary": true
}
],
"identifiers": [
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "LICENSE",
"identifier": "0515",
"state": "NJ"
}
],
"endpoints": [],
"other_names": []
}
Other providers in Montclair, NJ
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 24, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.