The Third Sister, PLLC

Primary specialty

OptometristTaxonomy code 152W00000X

Legal business name

THE THIRD SISTER, PLLC

Practice address

6630 FM 1463 Rd Ste a-400
Katy, TX 77494-7412

Phone

(832) 412-3553

NPI assigned

Sep 7, 2018

Organization subpart

No

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

Authorized official

Name

Mary H. DauNPI 1205210374

Title

Managing Member

Phone

(281) 394-7090

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in TX

Enrollment records 1

Locations

Practitioners 1

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles.

• Mary H. Dau, O.D.

  • Optometrist
  • Katy, TX
  • NPI 1205210374
  Medicare reassignment NPD Authorized official

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

{
    "created_epoch": "1536278400000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1774483200000",
    "number": "1881177616",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6630 FM 1463 RD STE A400",
            "city": "KATY",
            "state": "TX",
            "postal_code": "774947413",
            "telephone_number": "281-394-7090"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "6630 FM 1463 RD STE A-400",
            "city": "KATY",
            "state": "TX",
            "postal_code": "774947412",
            "telephone_number": "832-412-3553"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "THE THIRD SISTER, PLLC",
        "organizational_subpart": "NO",
        "enumeration_date": "2018-09-07",
        "last_updated": "2026-03-26",
        "certification_date": "2026-03-26",
        "status": "A",
        "authorized_official_last_name": "DAU",
        "authorized_official_first_name": "MARY",
        "authorized_official_middle_name": "H.",
        "authorized_official_title_or_position": "MANAGING MEMBER",
        "authorized_official_telephone_number": "281-394-7090"
    },
    "taxonomies": [
        {
            "code": "152W00000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Optometrist",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Optometrist in Katy, TX
• Providers in Katy, TX by specialty
• Optometrist in Texas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 26, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.