Active NPI
Stephen R Greene, M.D.
- Occupational Medicine Physician
- Lancaster, CA
National Provider Identifier
1659577823
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Occupational Medicine Physician
- License
- A44065
- Practice address
- 43835 10TH Street West
Lancaster, CA 93534 - Phone
- (661) 945-5999
- Fax
- (661) 948-2897
- NPI assigned
- Jun 25, 2007
- 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 4
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Internal Medicine Physician | 207R00000X | A44065 | CA | |
| Preventive Medicine/Occupational Environmental Medicine Physician | 2083P0500X | A44065 | CA | |
| Occupational Medicine Physician | 2083X0100X | A44065 | CA | Primary |
| Legal Medicine (M.D./D.O.) Physician | 209800000X | A44065 | CA |
Addresses
Primary practice location
43835 10TH Street West
Lancaster, CA 93534
Mailing address
1230 W 3Rd St
Los Angeles, CA 90017-1408
Phone (213) 977-9300
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
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| A44065 | CA | MD | Occupational Medicine Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Proactive Work Health Medical Center Inc | Past | Accepting new patients |
Organizations & group practices 1
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Multi-Specialty Clinic/Center
- Los Angeles, CA
- NPI 1336260421
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1182729600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1659577823",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1230 W 3RD ST",
"city": "LOS ANGELES",
"state": "CA",
"postal_code": "900171408",
"telephone_number": "213-977-9300",
"fax_number": "213-977-9600"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "43835 10TH STREET WEST",
"city": "LANCASTER",
"state": "CA",
"postal_code": "93534",
"telephone_number": "661-945-5999",
"fax_number": "661-948-2897"
}
],
"practiceLocations": [],
"basic": {
"last_name": "GREENE",
"first_name": "STEPHEN",
"middle_name": "R",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2007-06-25",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "207R00000X",
"taxonomy_group": "",
"desc": "Internal Medicine",
"state": "CA",
"license": "A44065",
"primary": false
},
{
"code": "2083P0500X",
"taxonomy_group": "",
"desc": "Preventive Medicine, Preventive Medicine/Occupational Environmental Medicine",
"state": "CA",
"license": "A44065",
"primary": false
},
{
"code": "2083X0100X",
"taxonomy_group": "",
"desc": "Preventive Medicine, Occupational Medicine",
"state": "CA",
"license": "A44065",
"primary": true
},
{
"code": "209800000X",
"taxonomy_group": "",
"desc": "Legal Medicine",
"state": "CA",
"license": "A44065",
"primary": false
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Lancaster, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.