NPIMap

Individual provider Active NPI

Alayna Renae Underdahl, NP

  • Nurse Practitioner
  • Austin, MN
National Provider Identifier
1154150431
Registry record updated Jun 8, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Nurse PractitionerTaxonomy code 363L00000X
License
12436 Issued in MN
Practice address
1000 1St Dr NW
Austin, MN 55912-2941
Phone
(507) 433-7351
NPI assigned
Jul 26, 2024
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jun 8, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Family Nurse Practitioner 363LF0000X A180610 IA
Nurse Practitioner 363L00000X 12436 MN Primary

Addresses

Primary practice location

1000 1St Dr NW
Austin, MN 55912-2941

Mailing address

PO Box 860912
Minneapolis, MN 55486-0912
Phone (507) 284-2511

Other practice location 1

803 9th Ave N
Northwood, IA 50459-1002
Phone (641) 324-1221

Other names 1

  • Alayna Renae Hall Former name

Electronic endpoints 2

TypeEndpointUseAffiliation
Direct Messaging Address ahall146406@ehrdirect.mayoclinicmsg.org
Direct Messaging Address aunderdahl3959641@direct.trinity-health.org Direct

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in IA, MN2 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
I20241001002812 IA Practitioner - Nurse Practitioner 6002347085 Reassigns benefits to 1 organization
I20260612000633 MN Practitioner - Nurse Practitioner 6002347085 Reassigns benefits to 10 organizations

Care Compare profile

Medicare Care Compare
Specialty
Nurse Practitioner
Education
Other, 2024
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
North Iowa Mercy ClinicsGroup PAC ID 7810809076, 304 clinicians

Practice addresses (Care Compare)

1000 4TH St SW
Mason City, IA 50401-2800

803 9TH Ave N
Mercyone Northwood Family Medicine
Northwood, IA 50459-1002
Phone (641) 324-1221

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
A180610IAMDFamily Nurse Practitioner

Practice roles

OrganizationSpecialtyStatusNew patients
North Iowa Mercy Clinics CurrentSince Sep 9, 2024 Accepting new patients
North Iowa Mercy Clinics CurrentSince Sep 9, 2024 Accepting new patients
North Iowa Mercy Clinics Current Accepting new patients
North Iowa Mercy Clinics Past Accepting new patients
North Iowa Mercy Clinics Past Accepting new patients

Locations

1000 4th St SW
Mason City, IA 50401
Phone (641) 424-6704

803 9th Ave N
Northwood, IA 50459
Phone (641) 324-1221

Interoperability endpoints

  • Direct secure messaging: aunderdahl3959641@direct.trinity-health.org

Organizations & group practices 15

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 15

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": "1721952000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1780876800000",
    "number": "1154150431",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 860912",
            "city": "MINNEAPOLIS",
            "state": "MN",
            "postal_code": "554860912",
            "telephone_number": "507-284-2511"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1000 1ST DR NW",
            "city": "AUSTIN",
            "state": "MN",
            "postal_code": "559122941",
            "telephone_number": "507-433-7351"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "803 9th Ave N",
            "address_purpose": "LOCATION",
            "city": "Northwood",
            "state": "IA",
            "postal_code": "504591002",
            "country_code": "US",
            "telephone_number": "641-324-1221",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "UNDERDAHL",
        "first_name": "ALAYNA",
        "middle_name": "RENAE",
        "credential": "NP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2024-07-26",
        "last_updated": "2026-06-08",
        "certification_date": "2026-06-08",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "IA",
            "license": "A180610",
            "primary": false
        },
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "MN",
            "license": "12436",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "ahall146406@ehrdirect.mayoclinicmsg.org",
            "affiliation": "N",
            "address_1": "1000 1st Dr NW",
            "city": "Austin",
            "state": "MN",
            "country_code": "US",
            "postal_code": "559122941",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "aunderdahl3959641@direct.trinity-health.org",
            "affiliation": "N",
            "endpointDescription": "MercyOne North Iowa Direct Email",
            "use": "DIRECT",
            "useDescription": "Direct",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "CCDA",
            "address_1": "803 9th Ave N",
            "city": "Northwood",
            "state": "IA",
            "country_code": "US",
            "postal_code": "504591002",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "ALAYNA",
            "last_name": "HALL",
            "middle_name": "RENAE",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

Other providers in Austin, MN

Sources for this page

Verify at the official NPI Registry.