Active NPI
William Fiala, PHD
- Psychologist
- Costa Mesa, CA
National Provider Identifier
1336055896
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Psychologist
- License
- PSY17213
- Practice address
- 1700 Adams Ave Ste 214
Costa Mesa, CA 92626-4865 - Phone
- (714) 957-1973
- NPI assigned
- Aug 24, 2026
- 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 |
|---|---|---|---|---|
| Psychologist | 103T00000X | PSY17213 | CA | Primary |
Addresses
Primary practice location
1700 Adams Ave Ste 214
Costa Mesa, CA 92626-4865
Mailing address
1700 Adams Ave Ste 214
Costa Mesa, CA 92626-4865
Phone (714) 957-1973
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1787529600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1787529600000",
"number": "1336055896",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1700 ADAMS AVE STE 214",
"city": "COSTA MESA",
"state": "CA",
"postal_code": "926264865",
"telephone_number": "714-957-1973"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1700 ADAMS AVE STE 214",
"city": "COSTA MESA",
"state": "CA",
"postal_code": "926264865",
"telephone_number": "714-957-1973"
}
],
"practiceLocations": [],
"basic": {
"last_name": "FIALA",
"first_name": "WILLIAM",
"credential": "PHD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2026-08-24",
"last_updated": "2026-08-24",
"certification_date": "2026-08-23",
"status": "A"
},
"taxonomies": [
{
"code": "103T00000X",
"taxonomy_group": "",
"desc": "Psychologist",
"state": "CA",
"license": "PSY17213",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Costa Mesa, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 24, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.