NPIMap

Individual provider Active NPI

Carolyn Sierra Rust, M.D.

  • Emergency Medicine Physician
  • Great Falls, MT
National Provider Identifier
1992097695
Registry record updated Oct 6, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Emergency Medicine PhysicianTaxonomy code 207P00000X
License
55916 Issued in MT
Practice address
1101 26TH St S
Great Falls, MT 59405-5161
Phone
(406) 455-5200
NPI assigned
May 12, 2011
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Oct 6, 2025

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Emergency Medicine Physician 207P00000X DR.0053676 CO
Emergency Medicine Physician 207P00000X 55916 MT Primary

Addresses

Primary practice location

1101 26TH St S
Great Falls, MT 59405-5161

Mailing address

PO Box 6010
Great Falls, MT 59406-6010

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MT
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20170419001001 MT Practitioner - Emergency Medicine 9032335799 Reassigns benefits to 4 organizations

Care Compare profile

Medicare Care Compare
Specialty
Emergency Medicine
Education
Albany Medical College of Union University, 2011
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Benefis Hospitals IncGroup PAC ID 1153235296, 390 clinicians

Practice addresses (Care Compare)

1401 25TH St S
Great Falls, MT 59405-5183
Phone (406) 455-5000

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
82.99 of 100Reported as group
Quality
62.64
Promoting interoperability
100
Improvement activities
40
Cost
80.67

Procedures performed for Medicare patients

ProcedureNumber of procedures
Removal of nail tissue1-10

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
DR.0053676COMDEmergency Medicine Physician
55916MTMDEmergency Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
St Peter's Medical Group North CurrentSince Apr 1, 2019 Accepting new patients
St Peter's Health Current Accepting new patients
St. Peter's Health CurrentSince Apr 1, 2019 Accepting new patients
Benefis Hospitals Inc CurrentSince Apr 1, 2018 Accepting new patients
Lewis and Clark Emergency Physicians P C Emergency Medicine CurrentSince Mar 13, 2017 Accepting new patients
St Peters Community Hospital Emergency Medicine CurrentSince Apr 1, 2019 Accepting new patients

Locations

1401 25th St S
Great Falls, MT 59405
Phone (406) 455-3650

1101 26th St S
Fl 5
Great Falls, MT 59405
Phone (406) 455-2132

1101 26th St S
Great Falls, MT 59405
Phone (406) 455-4690

2475 E Broadway St
Helena, MT 59601
Phone (406) 442-2480

3330 Ptarmigan Ln
Helena, MT 59602
Phone (406) 442-3570

Organizations & group practices 6

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.

Hospital & facility affiliations 3

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

NPI Registry JSON

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

{
    "created_epoch": "1305158400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1759708800000",
    "number": "1992097695",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 6010",
            "city": "GREAT FALLS",
            "state": "MT",
            "postal_code": "594066010"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1101 26TH ST S",
            "city": "GREAT FALLS",
            "state": "MT",
            "postal_code": "594055161",
            "telephone_number": "406-455-5200"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "RUST",
        "first_name": "CAROLYN",
        "middle_name": "SIERRA",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2011-05-12",
        "last_updated": "2025-10-06",
        "certification_date": "2025-10-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CO",
            "license": "DR.0053676",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "MT",
            "license": "55916",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Great Falls, MT

Sources for this page

Verify at the official NPI Registry.