Mallory Anne Grimste, LCSW

Primary specialty

Social WorkerTaxonomy code 104100000X

Practice address

250 W Main St Ste 203
Branford, CT 06405-4032

Phone

(203) 228-8971

Fax

(203) 429-8628

NPI assigned

Nov 10, 2010

Sex

Female

Sole proprietor

No

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

Opted out of Medicare

Yes, effective Dec 7, 2023 through Dec 7, 2027

Medicare enrollment (NPD)

Enrolled

State licenses

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.

• Mallory Grimste LLC

  dba Mallory Grimste, LCSW

  • Clinical Social Worker
  • Branford, CT
  • NPI 1417444910
  NPD Authorized official

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

{
    "created_epoch": "1289347200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1759708800000",
    "number": "1841591609",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "250 W MAIN ST STE 203",
            "city": "BRANFORD",
            "state": "CT",
            "postal_code": "064054032",
            "telephone_number": "203-228-8971",
            "fax_number": "203-429-8628"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "250 W MAIN ST STE 203",
            "city": "BRANFORD",
            "state": "CT",
            "postal_code": "064054032",
            "telephone_number": "203-228-8971",
            "fax_number": "203-429-8628"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GRIMSTE",
        "first_name": "MALLORY",
        "middle_name": "ANNE",
        "name_prefix": "Ms.",
        "credential": "LCSW",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2010-11-10",
        "last_updated": "2025-10-06",
        "certification_date": "2025-10-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "104100000X",
            "taxonomy_group": "",
            "desc": "Social Worker",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Marion S Grabowy, MD
• Darleen J Gracia, PSYD
• Karen A Gratrix, L.C.S.W.
• Jordan A. Greenberg, DDS
• Gloria Greenidge, LCSW
• Jordan A Gruskay, M.D.
• Katherine Wargo Gruskay, PNP
• Lucy Ling Gu, PHD
• Louis Guerrera Jr., RN
• Terea Wooster Guimaraes, APRN

• Social Worker in Branford, CT
• Providers in Branford, CT by specialty
• Social Worker in Connecticut

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 6, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Opt Out Affidavits.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.