Active NPI
Nathaniel Lawrence Witherow, CPSS
- Peer Specialist
- Spokane, WA
National Provider Identifier
1174486880
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Peer Specialist
- License
- CPST.PE.70121644
- Practice address
- 164 S State St Apt 411
Spokane, WA 99201-5137 - Phone
- (509) 475-0249
- NPI assigned
- Dec 9, 2025
- 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 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Peer Specialist | 175T00000X | CPST.PE.70121644 | WA | Primary |
Addresses
Primary practice location
164 S State St Apt 411
Spokane, WA 99201-5137
Mailing address
164 S State St Apt 411
Spokane, WA 99201-5137
Phone (509) 475-0249
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| CPST.PE.70121644 | Other | WA | CERTIFIED PEER SUPPORT SPECIALIST TRAINEE |
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
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Wsk12 Enterprise Group Inc. | Peer Specialist | Current | Accepting new patients |
Organizations & group practices 1
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": "1765238400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1785628800000",
"number": "1174486880",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "164 S STATE ST APT 411",
"city": "SPOKANE",
"state": "WA",
"postal_code": "992015137",
"telephone_number": "509-475-0249"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "164 S STATE ST APT 411",
"city": "SPOKANE",
"state": "WA",
"postal_code": "992015137",
"telephone_number": "509-475-0249"
}
],
"practiceLocations": [],
"basic": {
"last_name": "WITHEROW",
"first_name": "NATHANIEL",
"middle_name": "LAWRENCE",
"credential": "CPSS",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2025-12-09",
"last_updated": "2026-08-02",
"certification_date": "2026-08-02",
"status": "A"
},
"taxonomies": [
{
"code": "175T00000X",
"taxonomy_group": "",
"desc": "Peer Specialist",
"state": "WA",
"license": "CPST.PE.70121644",
"primary": true
}
],
"identifiers": [
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "CERTIFIED PEER SUPPORT SPECIALIST TRAINEE",
"identifier": "CPST.PE.70121644",
"state": "WA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Spokane, WA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 2, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.