NPIMap

Individual provider Active NPI

Nash John Hallfrisch, PA-C

  • Medical Physician Assistant
  • Great Falls, MT
National Provider Identifier
1184102162
Registry record updated Jul 21, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Medical Physician AssistantTaxonomy code 363AM0700X
License
69159 Issued in MT
Practice address
1400 29TH St S
Great Falls, MT 59405-5315
Phone
(406) 454-2171
NPI assigned
Aug 1, 2018
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 21, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Primary Care Clinic/Center 261QP2300X MED-PAC-LIC-69159 MT
Medical Physician Assistant 363AM0700X 69159 MT Primary

Addresses

Primary practice location

1400 29TH St S
Great Falls, MT 59405-5315

Mailing address

1400 29TH St S
Great Falls, MT 59405-5353
Phone (406) 454-2171

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
I20190207000068 MT Practitioner - Physician Assistant 5193063758 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Physician Assistant
Education
Other, 2018
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Great Falls Clinic LLCGroup PAC ID 8325944499, 73 clinicians

Practice addresses (Care Compare)

1400 29TH St S
Great Falls, MT 59405-5315
Phone (406) 454-2171

3000 15TH Ave S
Great Falls, MT 59405-5240
Phone (406) 454-2171

Hospital & facility affiliations

  • Benefis Community Care Inc Home health agency, Great Falls, MT, CCN 277090
  • Granite Peak Home Health Home health agency, Miles City, MT, CCN 277079
  • Great Falls Clinic Hospital Hospital, Great Falls, MT, CCN 270086
  • Benefis Hospitals Inc Hospital, Great Falls, MT, CCN 270012

Merit-based Incentive Payment System (MIPS)

Final score
90.98 of 100Reported as apm
Quality
80.39
Promoting interoperability
100
Improvement activities
40

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Physician Assistant

State licenses

LicenseStateTypeSpecialty
69159MTMDMedical Physician Assistant

Practice roles

OrganizationSpecialtyStatusNew patients
Frances Mahon Deaconess Hospital Past Accepting new patients

Interoperability endpoints

  • Direct secure messaging: nash.hallfrisch.1@25095.direct.athenahealth.com

Organizations & group practices 3

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.

Hospital & facility affiliations 6

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": "1533081600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1784592000000",
    "number": "1184102162",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1400 29TH ST S",
            "city": "GREAT FALLS",
            "state": "MT",
            "postal_code": "594055353",
            "telephone_number": "406-454-2171"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1400 29TH ST S",
            "city": "GREAT FALLS",
            "state": "MT",
            "postal_code": "594055315",
            "telephone_number": "406-454-2171"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HALLFRISCH",
        "first_name": "NASH",
        "middle_name": "JOHN",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-08-01",
        "last_updated": "2026-07-21",
        "certification_date": "2026-07-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "261QP2300X",
            "taxonomy_group": "",
            "desc": "Clinic/Center, Primary Care",
            "state": "MT",
            "license": "MED-PAC-LIC-69159",
            "primary": false
        },
        {
            "code": "363AM0700X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Medical",
            "state": "MT",
            "license": "69159",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Great Falls, MT

Sources for this page

Verify at the official NPI Registry.