NPIMap

Individual provider Active NPI

Abigail Carrie Holzwarth, DNP, APRN, FNP-BC

  • Nurse Practitioner
  • Billings, MT
National Provider Identifier
1104544576
Registry record updated Jan 7, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Nurse PractitionerTaxonomy code 363L00000X
License
198020 Issued in MT
Practice address
801 N 29TH St
Billings, MT 59101-0905
Phone
(406) 238-2500
NPI assigned
Aug 22, 2022
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jan 7, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Nurse Practitioner 363L00000X 198020 MT Primary
Family Nurse Practitioner 363LF0000X 198020 MT

Addresses

Primary practice location

801 N 29TH St
Billings, MT 59101-0905

Mailing address

PO Box 35100
Billings, MT 59107-5100

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address aholzwarth1@billingsclinic.cernerdirect.com Direct

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MT, WY2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20221111001201 MT Practitioner - Nurse Practitioner 9931576436 Reassigns benefits to 2 organizations
I20230112002614 WY Practitioner - Nurse Practitioner 9931576436 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Nurse Practitioner
Education
Other, 2022
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Billings ClinicGroup PAC ID 6002993516, 814 clinicians
Sheridan Memorial Hospital AssociationGroup PAC ID 9133038706, 31 clinicians

Practice addresses (Care Compare)

201 Yellowstone Ave
Cody, WY 82414-9313
Phone (307) 527-7561

440 W Laurel Ave
Plentywood, MT 59254-1526
Phone (406) 765-3700

801 N 29TH St
Billings, MT 59101-0905
Phone (406) 238-2500

Hospital & facility affiliations

  • Billings Clinic Hospital Hospital, Billings, MT, CCN 270004
  • Sheridan Memorial Hospital Hospital, Sheridan, WY, CCN 530006
  • North Big Horn Hospital District Hospital, Lovell, WY, CCN 531309
  • Powell Valley Hospital Hospital, Powell, WY, CCN 531310
  • Glendive Medical Center Hospital, Glendive, MT, CCN 271332

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Nurse Practitioner

State licenses

LicenseStateTypeSpecialty
198020MTMDNurse Practitioner

Practice roles

OrganizationSpecialtyStatusNew patients
Billings Clinic CurrentSince Oct 10, 2022 Accepting new patients
Billings Clinic CurrentSince Sep 1, 2022 Accepting new patients
Billings Clinic CurrentSince Sep 1, 2022 Accepting new patients
Billings Clinic Current Accepting new patients
Billings Clinic Current Accepting new patients
Frances Mahon Deaconess Hospital Past Accepting new patients

Locations

801 N 29th St
Billings, MT 59101
Phone (406) 238-2210

2800 10th Ave N
Billings, MT 59101
Phone (406) 248-3290

707 Sheridan Ave
Cody, WY 82414
Phone (307) 527-7561

201 Yellowstone Ave
Cody, WY 82414
Phone (307) 527-7561

Organizations & group practices 16

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.

View all 16

Hospital & facility affiliations 13

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

View all 13

NPI Registry JSON

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

{
    "created_epoch": "1661126400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767744000000",
    "number": "1104544576",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 35100",
            "city": "BILLINGS",
            "state": "MT",
            "postal_code": "591075100"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "801 N 29TH ST",
            "city": "BILLINGS",
            "state": "MT",
            "postal_code": "591010905",
            "telephone_number": "406-238-2500"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HOLZWARTH",
        "first_name": "ABIGAIL",
        "middle_name": "CARRIE",
        "credential": "DNP, APRN, FNP-BC",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2022-08-22",
        "last_updated": "2026-01-07",
        "certification_date": "2026-01-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "MT",
            "license": "198020",
            "primary": true
        },
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "MT",
            "license": "198020",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "aholzwarth1@billingsclinic.cernerdirect.com",
            "affiliation": "N",
            "endpointDescription": "direct email address",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "801 N 29th St",
            "city": "Billings",
            "state": "MT",
            "country_code": "US",
            "postal_code": "591010905",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Billings, MT

Sources for this page

Verify at the official NPI Registry.