William Christopher Baerthlein, LICSW

Primary specialty

Clinical Social WorkerTaxonomy code 1041C0700X

License

120784 Issued in MA

Practice address

200 Springs Rd
Mail Code: #122
Bedford, MA 01730-1114

Phone

(781) 382-5045

Fax

(781) 687-3422

NPI assigned

Jun 7, 2016

Last updated

Aug 26, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Otter Creek Psychotherapy, PLLC

  • Clinical Social Worker
  • Boston, MA
  • NPI 1932078649
  NPD Authorized official

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

{
    "created_epoch": "1465257600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756166400000",
    "number": "1720437197",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "200 SPRINGS RD",
            "address_2": "MAIL CODE: #122",
            "city": "BEDFORD",
            "state": "MA",
            "postal_code": "017301114",
            "telephone_number": "781-382-5045",
            "fax_number": "781-687-3422"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "200 SPRINGS RD",
            "address_2": "MAIL CODE: #122",
            "city": "BEDFORD",
            "state": "MA",
            "postal_code": "017301114",
            "telephone_number": "781-382-5045",
            "fax_number": "781-687-3422"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "101 Middlesex Tpke Ste 6 #313",
            "address_purpose": "LOCATION",
            "city": "Burlington",
            "state": "MA",
            "postal_code": "018034914",
            "country_code": "US",
            "telephone_number": "781-720-4752",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BAERTHLEIN",
        "first_name": "WILLIAM",
        "middle_name": "CHRISTOPHER",
        "credential": "LICSW",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2016-06-07",
        "last_updated": "2025-08-26",
        "certification_date": "2025-08-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "MA",
            "license": "220830",
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "MA",
            "license": "120784",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Holly Babineau
• Baby to Boomer Therapies, LLC
• Amy Elaine Rzeznikiewicz Bachand, PH.D.
• Emese Badics
• John Kevin Baer, DC
• Elizabeth Ann Bain
• Thom Stephen Baker, LICSW
• Ranjit Mohan Balse, MD
• Craig A Barnes, LCSW
• James Richard Barnes, D.C.

• Clinical Social Worker in Bedford, MA
• Providers in Bedford, MA by specialty
• Clinical Social Worker in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 26, 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.