Alwin Sebastian, M.D.

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

License

W1223 Issued in TX

Practice address

333 Borthwick Avenue
Portsmouth, NH 03801

Phone

(303) 563-9790

NPI assigned

May 23, 2022

Sex

Male

Sole proprietor

No

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

Specialties & licenses 3

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

Family Practice

Education

Other, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Hni Medical ServicesGroup PAC ID 6406028810, 35 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Valley Regional Medical Center Hospital, Brownsville, TX, CCN 450662

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: alwin.sebastian@hca6.eclinicaldirectplus.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.

• Hni Medical Services

  • Hospitalist Physician
  • Austin, TX
  • NPI 1366735169

  Family Medicine

  Medicare reassignment Care Compare group NPD
• Hni Hospital Services of Texas, Inc

  • Internal Medicine Physician
  • Austin, TX
  • NPI 1053884080
  Medicare reassignment
• Columbia Valley Healthcare System, L.P.

  • General Acute Care Hospital
  • Brownsville, TX
  • NPI 1043267701
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Columbia Valley Healthcare System, L.P.

  • General Acute Care Hospital
  • Brownsville, TX
  • NPI 1043267701
  Care Compare affiliation

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

{
    "created_epoch": "1653264000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758585600000",
    "number": "1740928514",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "333 BORTHWICK AVENUE",
            "city": "PORTSMOUTH",
            "state": "NH",
            "postal_code": "03801"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "333 BORTHWICK AVENUE",
            "city": "PORTSMOUTH",
            "state": "NH",
            "postal_code": "03801",
            "telephone_number": "303-563-9790"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "311 Route 108",
            "address_purpose": "LOCATION",
            "city": "Somersworth",
            "state": "NH",
            "postal_code": "038781522",
            "country_code": "US",
            "telephone_number": "603-749-2346",
            "fax_number": "603-953-0066",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SEBASTIAN",
        "first_name": "ALWIN",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2022-05-23",
        "last_updated": "2025-09-23",
        "certification_date": "2025-09-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "TX",
            "license": "W1223",
            "primary": false
        },
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "TX",
            "license": "W1223",
            "primary": true
        },
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "NH",
            "license": "R4045",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Seacoast Urolgy Associates
• Seacoast Wholistic Occupational Therapy, LLC
• Seaport Support
• Nathaniel C Sears
• Megan Seawards, APRN
• Chandler Secore
• Shauna Nancy Sedler, PMHNP
• Sarah Seedner
• Seeds for Change Counseling
• Nancy T. Seesman, APRN

• Family Medicine Physician in Portsmouth, NH
• Providers in Portsmouth, NH by specialty
• Family Medicine Physician in New Hampshire

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 23, 2025; 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.