Active NPI
Monica Marciniak-Gross, B.A.
- Social Worker
- Rialto, CA
National Provider Identifier
1184820656
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Social Worker
- Practice address
- 850 E Foothill Blvd
Rialto, CA 92376-5230 - Phone
- (909) 421-9465
- Fax
- (909) 421-9457
- NPI assigned
- Jun 22, 2007
- 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 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Addiction (Substance Use Disorder) Counselor | 101YA0400X | |||
| Social Worker | 104100000X | Primary |
Addresses
Primary practice location
850 E Foothill Blvd
Rialto, CA 92376-5230
Mailing address
850 E Foothill Blvd
Rialto, CA 92376-5230
Phone (909) 421-9465
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
- Credentials
- Bachelor of Arts
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1182470400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1184820656",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "850 E FOOTHILL BLVD",
"city": "RIALTO",
"state": "CA",
"postal_code": "923765230",
"telephone_number": "909-421-9465",
"fax_number": "909-421-9457"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "850 E FOOTHILL BLVD",
"city": "RIALTO",
"state": "CA",
"postal_code": "923765230",
"telephone_number": "909-421-9465",
"fax_number": "909-421-9457"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MARCINIAK-GROSS",
"first_name": "MONICA",
"name_prefix": "Mrs.",
"credential": "B.A.",
"sole_proprietor": "YES",
"sex": "F",
"enumeration_date": "2007-06-22",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "101YA0400X",
"taxonomy_group": "",
"desc": "Counselor, Addiction (Substance Use Disorder)",
"state": null,
"license": null,
"primary": false
},
{
"code": "104100000X",
"taxonomy_group": "",
"desc": "Social Worker",
"state": null,
"license": null,
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Rialto, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 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.