Mari Varga Overlock, PH. D.

Primary specialty

Mental Health CounselorTaxonomy code 101YM0800X

License

38298 Issued in TX

Practice address

4100 Summerhill Rd
Texarkana, TX 75503-2732

Phone

(903) 794-0011

Fax

(903) 838-8879

NPI assigned

Aug 19, 2019

Last updated

Sep 9, 2026By the provider in NPPES

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

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: No
• Power mobility devices: No
• Hospice: No

Green means eligible to order or refer.

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Philosophy

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.

• Mental Health Services of Texarkana PLLC

  • Mental Health Counselor
  • Texarkana, TX
  • NPI 1346178811
  NPD Authorized official
• Rafael F Otero, PHD, Inc

  • Clinical Psychologist
  • Texarkana, TX
  • NPI 1518902303
  NPD (past)

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

{
    "created_epoch": "1566172800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1788912000000",
    "number": "1861049520",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4100 SUMMERHILL RD",
            "city": "TEXARKANA",
            "state": "TX",
            "postal_code": "755032732",
            "telephone_number": "903-794-0011"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4100 SUMMERHILL RD",
            "city": "TEXARKANA",
            "state": "TX",
            "postal_code": "755032732",
            "telephone_number": "903-794-0011",
            "fax_number": "903-838-8879"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OVERLOCK",
        "first_name": "MARI",
        "middle_name": "VARGA",
        "name_prefix": "Dr.",
        "credential": "PH. D.",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2019-08-19",
        "last_updated": "2026-09-09",
        "certification_date": "2026-09-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YM0800X",
            "taxonomy_group": "",
            "desc": "Counselor, Mental Health",
            "state": "TX",
            "license": "38298",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Rafael F Otero, PHD
• Otm Health & Physical Therapy
• Otolaryngology and Head & Neck Surgery Associates, LLP (The ENT Group)
• Brianna Leigh Otwell, LPC INTERN
• Kouassi Adaman Ouattara, RPH
• Timothy L Overlock, M.D.
• Katherine Elizabeth Owen, PA C
• Owens Health Management LLC
• James Owens, FNP
• Michael James Owens, M.D.

• Mental Health Counselor in Texarkana, TX
• Providers in Texarkana, TX by specialty
• Mental Health Counselor in Texas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 9, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.