Active NPI
Karen Marie Allen, FNP - C
- Family Nurse Practitioner
- Marshfield, WI
National Provider Identifier
1497571996
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Family Nurse Practitioner
- License
- 15918-33
- Practice address
- 1000 N Oak Ave
Marshfield, WI 54449-5703 - Phone
- (715) 387-5511
- NPI assigned
- Nov 29, 2024
- Sex
- Female
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Family Nurse Practitioner | 363LF0000X | 15918-33 | WI | Primary |
Addresses
Primary practice location
1000 N Oak Ave
Marshfield, WI 54449-5703
Mailing address
1000 N Oak Ave
Marshfield, WI 54449-5703
Phone (715) 387-5511
Other practice location 1
700 West Ave S
LA Crosse, WI 54601-4783
Phone (608) 785-0940
Electronic endpoints 1
| Type | Endpoint | Use | Affiliation |
|---|---|---|---|
| Direct Messaging Address | him@marshfieldclinichealthsystem.cernerdirect.com |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in WI
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: No
Enrollment records 1
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20260609000134 | WI | Practitioner - Nurse Practitioner | 0345711586 | Reassigns benefits to 9 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
- MCHS Hospitals Inc
Practice addresses (Care Compare)
1000 N Oak Ave
Marshfield, WI 54449-5703
Phone (715) 387-5511
Hospital & facility affiliations
- Marshfield Medical Center
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 15918-33 | WI | MD | Family Nurse Practitioner |
Organizations & group practices 8
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 1
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": "1732838400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1780358400000",
"number": "1497571996",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1000 N OAK AVE",
"city": "MARSHFIELD",
"state": "WI",
"postal_code": "544495703",
"telephone_number": "715-387-5511"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1000 N OAK AVE",
"city": "MARSHFIELD",
"state": "WI",
"postal_code": "544495703",
"telephone_number": "715-387-5511"
}
],
"practiceLocations": [
{
"address_1": "700 West Ave S",
"address_purpose": "LOCATION",
"city": "LA Crosse",
"state": "WI",
"postal_code": "546014783",
"country_code": "US",
"telephone_number": "608-785-0940",
"country_name": "United States",
"address_type": "DOM"
}
],
"basic": {
"last_name": "ALLEN",
"first_name": "KAREN",
"middle_name": "MARIE",
"credential": "FNP - C",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2024-11-29",
"last_updated": "2026-06-02",
"certification_date": "2026-06-02",
"status": "A"
},
"taxonomies": [
{
"code": "363LF0000X",
"taxonomy_group": "",
"desc": "Nurse Practitioner, Family",
"state": "WI",
"license": "15918-33",
"primary": true
}
],
"identifiers": [],
"endpoints": [
{
"endpointType": "DIRECT",
"endpointTypeDescription": "Direct Messaging Address",
"endpoint": "him@marshfieldclinichealthsystem.cernerdirect.com",
"affiliation": "N",
"address_1": "1000 N Oak Ave",
"city": "Marshfield",
"state": "WI",
"country_code": "US",
"postal_code": "544495703",
"country_name": "United States",
"address_type": "DOM"
}
],
"other_names": []
}Other providers in Marshfield, WI
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 2, 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.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.