Active NPI
Diane Odell Williams
- Addiction (Substance Use Disorder) Counselor
- Ashland, CA
National Provider Identifier
1700728318
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Addiction (Substance Use Disorder) Counselor
- License
- 25532
- Practice address
- 15977 Marcella St
Ashland, CA 94578-2121 - Phone
- (510) 694-9422
- NPI assigned
- Apr 6, 2026
- Sex
- Female
- 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 |
|---|---|---|---|---|
| Addiction (Substance Use Disorder) Counselor | 101YA0400X | 25532 | CA | Primary |
Addresses
Primary practice location
15977 Marcella St
Ashland, CA 94578-2121
Mailing address
15978 Marcella
San Leandro, CA 94578
Phone (510) 694-9422
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 |
|---|---|---|---|
| 25532 | CA | MD | Occupational Therapist |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1775433600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1775433600000",
"number": "1700728318",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "15978 MARCELLA",
"city": "SAN LEANDRO",
"state": "CA",
"postal_code": "94578",
"telephone_number": "510-694-9422"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "15977 MARCELLA ST",
"city": "ASHLAND",
"state": "CA",
"postal_code": "945782121",
"telephone_number": "510-694-9422"
}
],
"practiceLocations": [],
"basic": {
"last_name": "WILLIAMS",
"first_name": "DIANE",
"middle_name": "ODELL",
"sole_proprietor": "YES",
"sex": "F",
"enumeration_date": "2026-04-06",
"last_updated": "2026-04-06",
"certification_date": "2026-03-30",
"status": "A"
},
"taxonomies": [
{
"code": "101YA0400X",
"taxonomy_group": "",
"desc": "Counselor, Addiction (Substance Use Disorder)",
"state": "CA",
"license": "25532",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Ashland, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 6, 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.