Active NPI
Ariel Ann Nelson, M.D.
- Hematology & Oncology Physician
- Madison, WI
National Provider Identifier
1083956148
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Hematology & Oncology Physician
- License
- 63243
- Practice address
- 1211 Fish Hatchery Rd
Madison, WI 53715-1909 - Phone
- (608) 252-8000
- Fax
- (608) 410-2905
- NPI assigned
- Mar 26, 2013
- 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 |
|---|---|---|---|---|
| Hematology & Oncology Physician | 207RH0003X | 63243 | WI | Primary |
Addresses
Primary practice location
1211 Fish Hatchery Rd
Madison, WI 53715-1909
Mailing address
9200 W Wisconsin Ave
CLCC - Fifth Floor
Milwaukee, WI 53226-3522
Phone (631) 896-1830
Other practice location 1
9200 W Wisconsin Ave
CLCC - Fifth Floor
Milwaukee, WI 53226-3522
Phone (414) 805-0509
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 1083956148 | Medicaid | WI |
Electronic endpoints 2
| Type | Endpoint | Use | Affiliation |
|---|---|---|---|
| FHIR URL | https://fhir.ssmhc.com/fhir/api/FHIR/DSTU2/ | Other | |
| Direct Messaging Address | anelson568808@direct-ehr-ssmhc.com | Direct |
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: Yes
Enrollment records 1
Care Compare profile
Medicare Care Compare- Specialty
- Hematology/Oncology
- Education
- State University of New York at Buffalo School of Medicine, 2013
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Telehealth
- Offers telehealth services
- Group practices
Practice addresses (Care Compare)
1211 Fish Hatchery Rd
Madison, WI 53715-1909
Phone (608) 252-8000
8701 W Watertown Plank
Milwaukee, WI 53226-3548
Phone (414) 805-3666
8701 Watertown Plank Rd
Room 4041 MFRC
Milwaukee, WI 53226-3548
Phone (414) 805-3666
Hospital & facility affiliations
- Froedtert Memorial Lutheran Hospital
- SSM Health St Mary'S Hospital - Madison
- SSM Health St Clare Hospital - Baraboo
- Columbus Community Hospital
- Stoughton Hospital
Merit-based Incentive Payment System (MIPS)
- Final score
- 87.99 of 100
- Quality
- 82.81
- Promoting interoperability
- 100
- Improvement activities
- 40
- Cost
- 77.15
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 63243 | WI | MD | Hematology & Oncology Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Dean Health Systems, Inc. | Current | Accepting new patients | |
| The Medical College of Wisconsin, Inc. | Current | Accepting new patients | |
| Dean Health Systems, Inc | Hematology & Oncology | Current | Accepting new patients |
Locations
1211 Fish Hatchery Rd
Madison, WI 53715
Phone (608) 252-8000
515 22nd Ave
Monroe, WI 53566
Phone (608) 324-1000
8701 Watertown Plank Rd
Wauwatosa, WI 53226
Phone (414) 456-4100
Interoperability endpoints
- anelsonmd122520@direct.froedtert.com
- anelson568808@direct-ehr-ssmhc.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.
-
- Allergy & Immunology Physician
- Madison, WI
- NPI 1053358846
Hematology & Oncology
-
- Internal Medicine Physician
- Milwaukee, WI
- NPI 1699720086
-
- Durable Medical Equipment & Medical Supplies
- Portage, WI
- NPI 1427085679
Hospital & facility affiliations 9
Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.
-
- General Acute Care Hospital
- Milwaukee, WI
- NPI 1255334173
-
- Critical Access Hospital
- Columbus, WI
- NPI 1154403657
-
- Critical Access Hospital
- Columbus, WI
- NPI 1841376183
-
- General Acute Care Hospital
- Baraboo, WI
- NPI 1386641207
-
- General Acute Care Hospital
- Madison, WI
- NPI 1184621211
-
- Critical Access Hospital
- Stoughton, WI
- NPI 1679558647
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1364256000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1771459200000",
"number": "1083956148",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "9200 W WISCONSIN AVE",
"address_2": "CLCC - FIFTH FLOOR",
"city": "MILWAUKEE",
"state": "WI",
"postal_code": "532263522",
"telephone_number": "631-896-1830",
"fax_number": "414-805-6808"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1211 FISH HATCHERY RD",
"city": "MADISON",
"state": "WI",
"postal_code": "537151909",
"telephone_number": "608-252-8000",
"fax_number": "608-410-2905"
}
],
"practiceLocations": [
{
"address_1": "9200 W Wisconsin Ave",
"address_2": "CLCC - Fifth Floor",
"address_purpose": "LOCATION",
"city": "Milwaukee",
"state": "WI",
"postal_code": "532263522",
"country_code": "US",
"telephone_number": "414-805-0509",
"fax_number": "414-805-6808",
"country_name": "United States",
"address_type": "DOM"
}
],
"basic": {
"last_name": "NELSON",
"first_name": "ARIEL",
"middle_name": "ANN",
"name_prefix": "Ms.",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2013-03-26",
"last_updated": "2026-02-19",
"certification_date": "2026-02-19",
"status": "A"
},
"taxonomies": [
{
"code": "207RH0003X",
"taxonomy_group": "",
"desc": "Internal Medicine, Hematology & Oncology",
"state": "WI",
"license": "63243",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "1083956148",
"state": "WI"
}
],
"endpoints": [
{
"endpointType": "FHIR",
"endpointTypeDescription": "FHIR URL",
"endpoint": "https://fhir.ssmhc.com/fhir/api/FHIR/DSTU2/",
"affiliation": "N",
"use": "OTHER",
"useDescription": "Other",
"useOtherDescription": "FHIR API",
"contentType": "OTHER",
"contentTypeDescription": "Other",
"contentOtherDescription": "CCD",
"address_1": "1211 Fish Hatchery Rd",
"city": "Madison",
"state": "WI",
"country_code": "US",
"postal_code": "537151909",
"country_name": "United States",
"address_type": "DOM"
},
{
"endpointType": "DIRECT",
"endpointTypeDescription": "Direct Messaging Address",
"endpoint": "anelson568808@direct-ehr-ssmhc.com",
"affiliation": "N",
"use": "DIRECT",
"useDescription": "Direct",
"contentType": "OTHER",
"contentTypeDescription": "Other",
"contentOtherDescription": "anelson568808@direct-ehr-ssmhc.com",
"address_1": "1211 Fish Hatchery Rd",
"city": "Madison",
"state": "WI",
"country_code": "US",
"postal_code": "537151909",
"country_name": "United States",
"address_type": "DOM"
}
],
"other_names": []
}Other providers in Madison, WI
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 19, 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.