Active NPI
Shawn Halton Portwood, RDN
- Registered Dietitian
- Madison, WI
National Provider Identifier
1487538542
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Registered Dietitian
- License
- 5429-29
- Practice address
- 2725 Marshall CT Apt 212
Madison, WI 53705-2288 - Phone
- (413) 275-3176
- NPI assigned
- Aug 2, 2025
- Sex
- Male
- 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 |
|---|---|---|---|---|
| Registered Dietitian | 133V00000X | 5429-29 | WI | Primary |
Addresses
Primary practice location
2725 Marshall CT Apt 212
Madison, WI 53705-2288
Mailing address
2725 Marshall CT Apt 212
Madison, WI 53705-2288
Phone (413) 275-3176
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 5429-29 | WI | MD | Registered Dietitian |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Anchor & Apex, LLC | Dietitian, Registered | Current | Accepting new patients |
| Nourish, Inc. | Dietitian, Registered | Past | Accepting new patients |
Organizations & group practices 2
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.
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1754092800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1754697600000",
"number": "1487538542",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "2725 MARSHALL CT APT 212",
"city": "MADISON",
"state": "WI",
"postal_code": "537052288",
"telephone_number": "413-275-3176"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "2725 MARSHALL CT APT 212",
"city": "MADISON",
"state": "WI",
"postal_code": "537052288",
"telephone_number": "413-275-3176"
}
],
"practiceLocations": [],
"basic": {
"last_name": "PORTWOOD",
"first_name": "SHAWN",
"middle_name": "HALTON",
"credential": "RDN",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2025-08-02",
"last_updated": "2025-08-09",
"certification_date": "2025-08-09",
"status": "A"
},
"taxonomies": [
{
"code": "133V00000X",
"taxonomy_group": "",
"desc": "Dietitian, Registered",
"state": "WI",
"license": "5429-29",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"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 Aug 9, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.