Maritssa Mathieu

Primary specialty

Mental Health CounselorTaxonomy code 101YM0800X

Practice address

80 Erdman Way Ste 208
Leominster, MA 01453-1840

Phone

(978) 870-1840

Fax

(978) 870-1846

NPI assigned

Nov 25, 2025

Sex

Female

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Practice roles

Locations

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.

• SB Transitional Sub, LLC

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • Brockton, MA
  • NPI 1962091173

  Single Specialty

  NPD
• South Bay Mental Health Center, Inc.

  dba South Bay Community Services

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • Brockton, MA
  • NPI 1023096864

  Single Specialty

  NPD

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1764028800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1764028800000",
    "number": "1619839032",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "147 RANGEWAY RD UNIT 4106",
            "city": "NORTH BILLERICA",
            "state": "MA",
            "postal_code": "018622046",
            "telephone_number": "617-790-4800"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "80 ERDMAN WAY STE 208",
            "city": "LEOMINSTER",
            "state": "MA",
            "postal_code": "014531840",
            "telephone_number": "978-870-1840",
            "fax_number": "978-870-1846"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MATHIEU",
        "first_name": "MARITSSA",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2025-11-25",
        "last_updated": "2025-11-25",
        "certification_date": "2025-11-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YM0800X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Counselor, Mental Health",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Mass Hearing Specialists
• Mass Lung & Allergy, P.C. (Sleep Center)
• Mass Lung & Allergy, PC.
• Mass Optometric Associates, PLLC (Mass Optometric Associates, PC)
• Daron C Massey, MD
• Leslie Kim Matilainen, LMHC
• Kathryn Churchill Mattison, LICSW
• Paula Hanney Mattson
• Karen Maypother
• Edna McAddy, M.D.

• Mental Health Counselor in Leominster, MA
• Providers in Leominster, MA by specialty
• Mental Health Counselor in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 25, 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.

Verify at the official NPI Registry.