Merlin Gerst, PT

Primary specialty

Physical TherapistTaxonomy code 225100000X

License

16129 Issued in MA

Practice address

840 Winter St
Waltham, MA 02451

Phone

(781) 487-9944

Fax

(781) 487-9966

NPI assigned

Nov 21, 2005

Sex

Male

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

Enrolled in MA

Enrollment records 1

Specialty

Physical Therapist in Private Practice

Education

Other, 2002

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Fox Rehab Ma LLCGroup PAC ID 3678895000, 18 clinicians

Practice addresses (Care Compare)

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.

• Fox Rehab Ma LLC

  • Physical Therapist
  • Waltham, MA
  • NPI 1497174437
  Medicare reassignment Care Compare group NPD
• Prescription Orthopedic and Sports Therapy

  • Physical Therapist
  • Brookline, MA
  • NPI 1588641807
  NPD (past)

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

{
    "created_epoch": "1132531200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1295718658",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "840 WINTER ST",
            "city": "WALTHAM",
            "state": "MA",
            "postal_code": "02451",
            "telephone_number": "781-487-9944",
            "fax_number": "781-487-9966"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "840 WINTER ST",
            "city": "WALTHAM",
            "state": "MA",
            "postal_code": "02451",
            "telephone_number": "781-487-9944",
            "fax_number": "781-487-9966"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GERST",
        "first_name": "MERLIN",
        "credential": "PT",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-11-21",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "225100000X",
            "taxonomy_group": "",
            "desc": "Physical Therapist",
            "state": "MA",
            "license": "16129",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Colleen E George, M.A. CCC-SLP
• Andrea Lynne Geraci, ANDREA GERACI LAC
• Nicole Geraghty
• Deborah Idelle Gerofsky, LICSW
• Yeraldi Geronimo, MS
• Ghialeex LLC
• Irene Ghobrial, PA-C
• Victoria Giaccone, OTD
• Erin Gibbons, LCSW
• Rachel Gibbons, MS, OTR/L

• Physical Therapist in Waltham, MA
• Providers in Waltham, MA by specialty
• Physical Therapist in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.