Active NPI
Alison Alderdice, PSYD
- Psychologist
- Petaluma, CA
National Provider Identifier
1487199584
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Psychologist
- License
- 28838
- Practice address
- PO Box 544
Petaluma, CA 94953-0544 - Phone
- (415) 505-2133
- NPI assigned
- Dec 27, 2016
- Last updated
- Sep 15, 2026
- 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 |
|---|---|---|---|---|
| Psychologist | 103T00000X | 28838 | CA | Primary |
Addresses
Primary practice location
PO Box 544
Petaluma, CA 94953-0544
Mailing address
PO Box 544
Petaluma, CA 94953-0544
Phone (415) 505-2133
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: Yes
- Medical equipment: Yes
- Home health: No
- Power mobility devices: No
- Hospice: No
- Opted out of Medicare
- Previously, effective Aug 25, 2022 through Aug 25, 2026
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 28838 | CA | MD | Psychologist |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1482796800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1789430400000",
"number": "1487199584",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "PO BOX 544",
"city": "PETALUMA",
"state": "CA",
"postal_code": "949530544",
"telephone_number": "415-505-2133"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "PO BOX 544",
"city": "PETALUMA",
"state": "CA",
"postal_code": "949530544",
"telephone_number": "415-505-2133"
}
],
"practiceLocations": [],
"basic": {
"last_name": "ALDERDICE",
"first_name": "ALISON",
"credential": "PSYD",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2016-12-27",
"last_updated": "2026-09-15",
"certification_date": "2026-09-15",
"status": "A"
},
"taxonomies": [
{
"code": "103T00000X",
"taxonomy_group": "",
"desc": "Psychologist",
"state": "CA",
"license": "28838",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Petaluma, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 15, 2026; 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; Opt Out Affidavits.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.