Active NPI
Antonia Sierra Littleton, AMFT
- Marriage & Family Therapist
- San Francisco, CA
National Provider Identifier
1578425104
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Marriage & Family Therapist
- License
- 158729
- Practice address
- 221 16TH Ave Apt 3
San Francisco, CA 94118-1058 - Phone
- (510) 965-2072
- NPI assigned
- Dec 2, 2025
- 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 |
|---|---|---|---|---|
| Marriage & Family Therapist | 106H00000X | 158729 | CA | Primary |
Addresses
Primary practice location
221 16TH Ave Apt 3
San Francisco, CA 94118-1058
Mailing address
221 16TH Ave Apt 3
San Francisco, CA 94118-1058
Phone (510) 965-2072
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 |
|---|---|---|---|
| 158729 | CA | MD | Marriage & Family Therapist |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1764633600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1764633600000",
"number": "1578425104",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "221 16TH AVE APT 3",
"city": "SAN FRANCISCO",
"state": "CA",
"postal_code": "941181058",
"telephone_number": "510-965-2072"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "221 16TH AVE APT 3",
"city": "SAN FRANCISCO",
"state": "CA",
"postal_code": "941181058",
"telephone_number": "510-965-2072"
}
],
"practiceLocations": [],
"basic": {
"last_name": "LITTLETON",
"first_name": "ANTONIA",
"middle_name": "SIERRA",
"credential": "AMFT",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2025-12-02",
"last_updated": "2025-12-02",
"certification_date": "2025-12-02",
"status": "A"
},
"taxonomies": [
{
"code": "106H00000X",
"taxonomy_group": "",
"desc": "Marriage & Family Therapist",
"state": "CA",
"license": "158729",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in San Francisco, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 2, 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.