Active NPI
Katherine E Duffy-Sherr
- Speech-Language Pathologist
- Antioch, CA
National Provider Identifier
1417893975
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Speech-Language Pathologist
- License
- 20014
- Practice address
- 4207B Delta Fair Blvd
Antioch, CA 94509-3944 - Phone
- (925) 777-2000
- NPI assigned
- Apr 27, 2026
- Sex
- Unspecified or another gender identity
- 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 |
|---|---|---|---|---|
| Speech-Language Pathologist | 235Z00000X | 20014 | CA | Primary |
Addresses
Primary practice location
4207B Delta Fair Blvd
Antioch, CA 94509-3944
Mailing address
77 Santa Barbara Rd
Pleasant Hill, CA 94523-4201
Phone (925) 942-3388
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 |
|---|---|---|---|
| 20014 | CA | MD | Pediatrics Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1777248000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1777248000000",
"number": "1417893975",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "77 SANTA BARBARA RD",
"city": "PLEASANT HILL",
"state": "CA",
"postal_code": "945234201",
"telephone_number": "925-942-3388"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "4207B DELTA FAIR BLVD",
"city": "ANTIOCH",
"state": "CA",
"postal_code": "945093944",
"telephone_number": "925-777-2000"
}
],
"practiceLocations": [],
"basic": {
"last_name": "DUFFY-SHERR",
"first_name": "KATHERINE",
"middle_name": "E",
"sole_proprietor": "NO",
"sex": "X",
"enumeration_date": "2026-04-27",
"last_updated": "2026-04-27",
"certification_date": "2026-04-27",
"status": "A"
},
"taxonomies": [
{
"code": "235Z00000X",
"taxonomy_group": "",
"desc": "Speech-Language Pathologist",
"state": "CA",
"license": "20014",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Antioch, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 27, 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.