Active NPI
Alex James Linn, M.D.
- Vascular Neurology Physician
- Sioux Falls, SD
National Provider Identifier
1003177338
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Vascular Neurology Physician
- License
- 11423
- Practice address
- 1301 S Cliff Ave Ste 610
Sioux Falls, SD 57105 - Phone
- (605) 322-8860
- Fax
- (605) 322-8868
- NPI assigned
- Jun 4, 2012
- Sex
- Male
- Sole proprietor
- Yes
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Neurology Physician | 2084N0400X | 11423 | SD | |
| Vascular Neurology Physician | 2084V0102X | 11423 | SD | Primary |
Addresses
Primary practice location
1301 S Cliff Ave Ste 610
Sioux Falls, SD 57105
Mailing address
1301 S Cliff Ave Ste 610
Sioux Falls, SD 57105-1032
Phone (605) 322-8860
Other practice location 1
788 Service Rd Ste B-401
East Lansing, MI 48824-7013
Phone (517) 432-9277
Other practice location 2
1215 E Michigan Ave
Lansing, MI 48912-1811
Phone (517) 432-9277
Other practice location 3
1325 S. Cliff Ave
Dept of Neuro-Endovascular Surgery
Sioux Falls, SD 57105-1032
Phone (605) 332-8000
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in SD
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 1
Care Compare profile
Medicare Care Compare- Specialty
- Neurology
- Education
- Other, 2011
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
Practice addresses (Care Compare)
1301 S Cliff Ave
Suite 610
Sioux Falls, SD 57105-1032
Phone (605) 322-8860
Hospital & facility affiliations
- Avera McKennan Hospital & University Health Center
- Avera Sacred Heart Hospital
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 11423 | SD | MD | Neurology Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Avera McKennan | Current | Accepting new patients | |
| Avera McKennan | Current | Accepting new patients | |
| Avera McKennan | Current | Accepting new patients |
Locations
1325 S Cliff Ave
Sioux Falls, SD 57105
Phone (605) 322-5000
1301 S Cliff Ave
Ste 610
Sioux Falls, SD 57105
Phone (605) 322-8860
Interoperability endpoints
- alex.linn@avera.sdhealthlink.net
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.
-
- Mental Health Clinic/Center (Including Community Mental Health Center)
- Sioux Falls, SD
- NPI 1699009944
-
- Diagnostic Radiology Physician
- Sioux Falls, SD
- NPI 1053680678
-
- Neurological Surgery Physician
- Sioux Falls, SD
- NPI 1114113693
Hospital & facility affiliations 29
Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.
-
- General Acute Care Hospital
- Sioux Falls, SD
- NPI 1154531630
-
- General Acute Care Hospital
- Sioux Falls, SD
- NPI 1184834764
-
- Endocrinology, Diabetes & Metabolism Physician
- Sioux Falls, SD
- NPI 1396711016
Hospital
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1338768000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1778025600000",
"number": "1003177338",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1301 S CLIFF AVE STE 610",
"city": "SIOUX FALLS",
"state": "SD",
"postal_code": "571051032",
"telephone_number": "605-322-8860",
"fax_number": "605-322-8868"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1301 S CLIFF AVE STE 610",
"city": "SIOUX FALLS",
"state": "SD",
"postal_code": "57105",
"telephone_number": "605-322-8860",
"fax_number": "605-322-8868"
}
],
"practiceLocations": [
{
"address_1": "788 Service Rd Ste B-401",
"address_purpose": "LOCATION",
"city": "East Lansing",
"state": "MI",
"postal_code": "488247013",
"country_code": "US",
"telephone_number": "517-432-9277",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "1215 E Michigan Ave",
"address_purpose": "LOCATION",
"city": "Lansing",
"state": "MI",
"postal_code": "489121811",
"country_code": "US",
"telephone_number": "517-432-9277",
"fax_number": "517-432-9414",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "1325 S. Cliff Ave",
"address_2": "Dept of Neuro-Endovascular Surgery",
"address_purpose": "LOCATION",
"city": "Sioux Falls",
"state": "SD",
"postal_code": "571051032",
"country_code": "US",
"telephone_number": "605-332-8000",
"country_name": "United States",
"address_type": "DOM"
}
],
"basic": {
"last_name": "LINN",
"first_name": "ALEX",
"middle_name": "JAMES",
"name_prefix": "Dr.",
"credential": "M.D.",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2012-06-04",
"last_updated": "2026-05-06",
"certification_date": "2026-05-06",
"status": "A"
},
"taxonomies": [
{
"code": "2084N0400X",
"taxonomy_group": "",
"desc": "Psychiatry & Neurology, Neurology",
"state": "SD",
"license": "11423",
"primary": false
},
{
"code": "2084V0102X",
"taxonomy_group": "",
"desc": "Psychiatry & Neurology, Vascular Neurology",
"state": "SD",
"license": "11423",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Sioux Falls, SD
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 6, 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.