Thomas Kirk O'Brien, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

406214 Issued in MI

Practice address

6276 Jackson Rd
Suite B
Ann Arbor, MI 48103-9579

Phone

(734) 663-4490

NPI assigned

Mar 16, 2006

Last updated

Jul 13, 2026By the provider in NPPES

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

Other identifiers 1

Medicare fee-for-service enrollment

Enrolled in MI

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

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.

• Chelsea Area Primary Care PLLC

  • Internal Medicine Physician
  • Ann Arbor, MI
  • NPI 1245435486
  Authorized official Same address or phone
• Chelsea Community Hospital

  • Urgent Care Clinic/Center
  • Chelsea, MI
  • NPI 1033778733
  NPD (past)

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

{
    "created_epoch": "1142467200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1033188545",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6276 JACKSON RD",
            "address_2": "SUITE B",
            "city": "ANN ARBOR",
            "state": "MI",
            "postal_code": "481039579",
            "telephone_number": "734-663-4490"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "6276 JACKSON RD",
            "address_2": "SUITE B",
            "city": "ANN ARBOR",
            "state": "MI",
            "postal_code": "481039579",
            "telephone_number": "734-663-4490"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "THOMAS",
        "middle_name": "KIRK",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-16",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MI",
            "license": "406214",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "2871468",
            "state": "MI"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Karen O'Banion, MA,CCC,SLP
• Jeff O'Boyle, D.O.
• Edmond O'Brien, M.D.
• Hope Baldwin O'Brien
• Jerrod O'Brien, LPC
• Victoria Marie O'Brien
• Marion R O'Bryan, LMSW
• Thomas Neil O'Callaghan, MD
• John Maurice O'Connell
• Lauren Katherine Beyer O'Connell, MD

• Internal Medicine Physician in Ann Arbor, MI
• Providers in Ann Arbor, MI by specialty
• Internal Medicine Physician in Michigan

• 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; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.