Active NPI
Nathan A Oatis, MSW, LCSW
- Clinical Social Worker
- Saint Louis, MO
National Provider Identifier
1295505667
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Clinical Social Worker
- License
- 2021049186
- Practice address
- 3109 S Grand Blvd Ste 200C
Saint Louis, MO 63118-1039 - Phone
- (314) 691-0903
- NPI assigned
- Jan 5, 2024
- 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 |
|---|---|---|---|---|
| Clinical Social Worker | 1041C0700X | 2021049186 | MO | Primary |
Addresses
Primary practice location
3109 S Grand Blvd Ste 200C
Saint Louis, MO 63118-1039
Mailing address
3109 S Grand Blvd Ste 200C
Saint Louis, MO 63118-1039
Phone (314) 691-0903
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 490136018 | Medicaid | MO |
Electronic endpoints 1
| Type | Endpoint | Use | Affiliation |
|---|---|---|---|
| FHIR URL | https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2/ | Washington University |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
- Eligible to order & refer
- Part B services: No
- Medical equipment: Yes
- Home health: No
- Power mobility devices: No
- Hospice: No
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 2021049186 | MO | MD | Clinical Social Worker |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1704412800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1766361600000",
"number": "1295505667",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "3109 S GRAND BLVD STE 200C",
"city": "SAINT LOUIS",
"state": "MO",
"postal_code": "631181039",
"telephone_number": "314-691-0903"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "3109 S GRAND BLVD STE 200C",
"city": "SAINT LOUIS",
"state": "MO",
"postal_code": "631181039",
"telephone_number": "314-691-0903"
}
],
"practiceLocations": [],
"basic": {
"last_name": "OATIS",
"first_name": "NATHAN",
"middle_name": "A",
"name_prefix": "Mr.",
"credential": "MSW, LCSW",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2024-01-05",
"last_updated": "2025-12-22",
"certification_date": "2025-12-22",
"status": "A"
},
"taxonomies": [
{
"code": "1041C0700X",
"taxonomy_group": "",
"desc": "Social Worker, Clinical",
"state": "MO",
"license": "2021049186",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "490136018",
"state": "MO"
}
],
"endpoints": [
{
"endpointType": "FHIR",
"endpointTypeDescription": "FHIR URL",
"endpoint": "https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2/",
"affiliation": "Y",
"affiliationName": "Washington University",
"address_1": "4444 Forest Park Ave",
"address_2": "Ste 2600",
"city": "Saint Louis",
"state": "MO",
"country_code": "US",
"postal_code": "631082212",
"country_name": "United States",
"address_type": "DOM"
}
],
"other_names": []
}Other providers in Saint Louis, MO
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 22, 2025; 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.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.