Elizabeth A O'Callahan, LMHC, BCBA, LABA

Primary specialty

Mental Health CounselorTaxonomy code 101YM0800X

License

LMHC13213 Issued in MA

Practice address

14 Victoria Ave
Worcester, MA 01607-1506

Phone

(508) 233-8586

Fax

(774) 366-0757

NPI assigned

Jan 18, 2012

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

State licenses

Practice roles

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.

• Evenstar Therapy, LLC

  • Mental Health Counselor
  • Worcester, MA
  • NPI 1043141674
  NPD Authorized official
• Evenstar Therapy, LLC

  • Mental Health Counselor
  • Worcester, MA
  • NPI 1972431195
  NPD (past) Authorized official

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

{
    "created_epoch": "1326844800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782345600000",
    "number": "1548531916",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "14 VICTORIA AVE",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "016071506",
            "telephone_number": "508-233-8586",
            "fax_number": "774-366-0757"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "14 VICTORIA AVE",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "016071506",
            "telephone_number": "508-233-8586",
            "fax_number": "774-366-0757"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'CALLAHAN",
        "first_name": "ELIZABETH",
        "middle_name": "A",
        "credential": "LMHC, BCBA, LABA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2012-01-18",
        "last_updated": "2026-06-25",
        "certification_date": "2026-06-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YM0800X",
            "taxonomy_group": "",
            "desc": "Counselor, Mental Health",
            "state": "MA",
            "license": "LMHC13213",
            "primary": true
        },
        {
            "code": "103K00000X",
            "taxonomy_group": "",
            "desc": "Behavior Analyst",
            "state": "MA",
            "license": "LABA1305",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Kaylee R O'Brien
• Kaylin O'Brien, MS, GC
• Lauren Jane O'Brien, PA
• Maryellen O'Brien, LMHC
• Sarah O'Brien, FNP
• Taylin O'Coin, MA
• George G O'Connell Jr.
• Lauren Colby O'Connell, ACNP-BC
• Megan O'Connell
• Trisha Lynne O'Connell, LMHC

• Mental Health Counselor in Worcester, MA
• Providers in Worcester, 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 Jun 25, 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.

Verify at the official NPI Registry.