Active NPI
Harold Marks, MD
- Surgery Physician
- Northridge, CA
National Provider Identifier
1568422822
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Surgery Physician
- License
- G47893
- Practice address
- 18350 Roscoe Blvd
Suite 505
Northridge, CA 91325-4109 - Phone
- (818) 886-3400
- Fax
- (818) 886-3402
- NPI assigned
- Mar 23, 2006
- 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 |
|---|---|---|---|---|
| Surgery Physician | 208600000X | G47893 | CA | Primary |
Addresses
Primary practice location
18350 Roscoe Blvd
Suite 505
Northridge, CA 91325-4109
Mailing address
18350 Roscoe Blvd Suite 505
Northridge, CA 91325
Phone (818) 886-3400
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)
- Enrolled
- Credentials
- Doctor of Medicine
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1143072000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1568422822",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "18350 ROSCOE BLVD SUITE 505",
"city": "NORTHRIDGE",
"state": "CA",
"postal_code": "91325",
"telephone_number": "818-886-3400",
"fax_number": "818-886-3402"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "18350 ROSCOE BLVD",
"address_2": "SUITE 505",
"city": "NORTHRIDGE",
"state": "CA",
"postal_code": "913254109",
"telephone_number": "818-886-3400",
"fax_number": "818-886-3402"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MARKS",
"first_name": "HAROLD",
"name_prefix": "Dr.",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2006-03-23",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "208600000X",
"taxonomy_group": "",
"desc": "Surgery",
"state": "CA",
"license": "G47893",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Northridge, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.