William J. Allen Jr., M.D.

Primary specialty

Pediatrics PhysicianTaxonomy code 208000000X

License

MED-PHYS-LIC-28240 Issued in MT

Practice address

875 S Cottonwood Rd Ste 300
Bozeman, MT 59718-4221

Phone

(406) 414-4100

NPI assigned

Oct 22, 2010

Last updated

Jan 21, 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 2

Addresses

Other identifiers 1

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in MT

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

Locations

Interoperability endpoints

• Direct secure messaging: wallen7290933@direct.sanfordhealth.org

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.

• Bozeman Health Big Sky Medical Center, LLC

  • Family Medicine Physician
  • Big Sky, MT
  • NPI 1740659952
  Medicare reassignment NPD
• Bozeman Health Deaconess Hospital

  • Family Medicine Physician
  • Bozeman, MT
  • NPI 1619347390

  Pediatrics

  Medicare reassignment NPD
• Bozeman Health Big Sky Medical Center, LLC

  dba Bozeman Health Big Sky Medical Center

  • Critical Access Hospital
  • Big Sky, MT
  • NPI 1588141048
  NPD
• Bozeman Health Deaconess Hospital

  • Durable Medical Equipment & Medical Supplies
  • Bozeman, MT
  • NPI 1013733955
  NPD
• Bozeman Health Deaconess Hospital

  • General Acute Care Hospital
  • Bozeman, MT
  • NPI 1104295864
  NPD (past)

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

{
    "created_epoch": "1287705600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1768953600000",
    "number": "1932409133",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "915 HIGHLAND BLVD",
            "city": "BOZEMAN",
            "state": "MT",
            "postal_code": "597156902",
            "telephone_number": "406-414-1720",
            "fax_number": "406-414-1071"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "875 S COTTONWOOD RD STE 300",
            "city": "BOZEMAN",
            "state": "MT",
            "postal_code": "597184221",
            "telephone_number": "406-414-4100"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ALLEN",
        "first_name": "WILLIAM",
        "middle_name": "J.",
        "name_prefix": "Dr.",
        "name_suffix": "Jr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2010-10-22",
        "last_updated": "2026-01-21",
        "certification_date": "2026-01-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "KY",
            "license": "43930",
            "primary": false
        },
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "MT",
            "license": "MED-PHYS-LIC-28240",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "1932409133",
            "state": "MT"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "wallen7290933@direct.sanfordhealth.org",
            "affiliation": "Y",
            "affiliationName": "Bozeman Health Deaconess Hospital",
            "use": "DIRECT",
            "useDescription": "Direct",
            "contentType": "CSV",
            "contentTypeDescription": "CSV",
            "address_1": "937 Highland Blvd Ste 5320",
            "city": "Bozeman",
            "state": "MT",
            "country_code": "US",
            "postal_code": "597156916",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• All Is Well Staffing LLC
• All Set Medics LLC
• Cadence Allen
• Elizabeth Allen, LMT, NCTMB
• Mary Elizabeth Allen
• Allergy and Asthma Consultants of Montana, PLLC
• Janel Lea Allison-Shamblin, PA-C
• Michelle Allmendinger, LPN
• Ally Psychiatric Wellness
• Meira Aliza Alon

• Pediatrics Physician in Bozeman, MT
• Providers in Bozeman, MT by specialty
• Pediatrics Physician in Montana

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 21, 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.