Active NPI
Mark Workman, CADC-II
- Addiction (Substance Use Disorder) Counselor
- Oak View, CA
National Provider Identifier
1407709454
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Addiction (Substance Use Disorder) Counselor
- License
- A053681218
- Practice address
- 158 Rockaway Rd
Oak View, CA 93022-9306 - Phone
- (805) 273-8798
- Fax
- (805) 666-3603
- NPI assigned
- Feb 18, 2026
- Sex
- Male
- 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 | A053681218 | CA | Primary |
Addresses
Primary practice location
158 Rockaway Rd
Oak View, CA 93022-9306
Mailing address
411 W Esplanade Dr # 1041
Oxnard, CA 93036-1298
Phone (805) 336-6064
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 |
|---|---|---|---|
| A053681218 | CA | MD | Addiction (Substance Use Disorder) Counselor |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1771372800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1771372800000",
"number": "1407709454",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "411 W ESPLANADE DR # 1041",
"city": "OXNARD",
"state": "CA",
"postal_code": "930361298",
"telephone_number": "805-336-6064",
"fax_number": "805-666-3603"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "158 ROCKAWAY RD",
"city": "OAK VIEW",
"state": "CA",
"postal_code": "930229306",
"telephone_number": "805-273-8798",
"fax_number": "805-666-3603"
}
],
"practiceLocations": [],
"basic": {
"last_name": "WORKMAN",
"first_name": "MARK",
"credential": "CADC-II",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2026-02-18",
"last_updated": "2026-02-18",
"certification_date": "2026-02-18",
"status": "A"
},
"taxonomies": [
{
"code": "101YA0400X",
"taxonomy_group": "",
"desc": "Counselor, Addiction (Substance Use Disorder)",
"state": "CA",
"license": "A053681218",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Oak View, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 18, 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.