Sean James O'Sullivan, MD, PHD

Primary specialty

Psychiatry PhysicianTaxonomy code 2084P0800X

License

W4561 Issued in TX

Practice address

1601 Trinity St
Austin, TX 78712-1765

Phone

(833) 882-2737

NPI assigned

May 26, 2022

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 TX

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Psychiatry

Education

Other, 2021

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine, Doctor of Philosophy

State licenses

Practice roles

Interoperability endpoints

• Direct secure messaging: sean.osullivan.1@8363.direct.athenahealth.com

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.

• University of Texas at Austin Dell Medical School

  • General Practice Physician
  • Austin, TX
  • NPI 1073066239
  NPD (past)
• University of Texas at Austin Dell Medical School

  • Ambulatory Surgical Clinic/Center
  • Austin, TX
  • NPI 1780218305
  NPD (past)

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

{
    "created_epoch": "1653523200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782777600000",
    "number": "1609514702",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 739960",
            "city": "DALLAS",
            "state": "TX",
            "postal_code": "753739960"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1601 TRINITY ST",
            "city": "AUSTIN",
            "state": "TX",
            "postal_code": "787121765",
            "telephone_number": "833-882-2737"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'SULLIVAN",
        "first_name": "SEAN",
        "middle_name": "JAMES",
        "credential": "MD, PHD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2022-05-26",
        "last_updated": "2026-06-30",
        "certification_date": "2026-06-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2084P0800X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Psychiatry",
            "state": "TX",
            "license": "W4561",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Katherine Kistler O'Rourke, MPH, RDN, LD
• Emily Janine O'Shea, LCSW
• Milagritos Barrantes O'Shea, LMFT
• Nicholas Robert O'Sick, DO
• Katie Laura O'Sullivan, DPT
• Dale Dimatos O'Toole, OTR, CHT
• Devin O'Toole, MD
• Oak & Summit LLC
• Oak Hill Dental
• Oak Hill Family Dental Center, P.C.

• Psychiatry Physician in Austin, TX
• Providers in Austin, TX by specialty
• Psychiatry Physician in Texas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 30, 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.
• 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.