Active NPI
Justin Matthew Zaslavsky, MD
- Pediatrics Physician
- Palo Alto, CA
National Provider Identifier
1174324404
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Pediatrics Physician
- License
- PTL20780
- Practice address
- 300 Pasteur Dr
Palo Alto, CA 94305-2200 - Phone
- (650) 723-4000
- NPI assigned
- Mar 22, 2025
- 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 |
|---|---|---|---|---|
| Pediatrics Physician | 208000000X | PTL20780 | CA | Primary |
Addresses
Primary practice location
300 Pasteur Dr
Palo Alto, CA 94305-2200
Mailing address
300 Pasteur Dr
Palo Alto, CA 94305-2200
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
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1742601600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1786924800000",
"number": "1174324404",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "300 PASTEUR DR",
"city": "PALO ALTO",
"state": "CA",
"postal_code": "943052200"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "300 PASTEUR DR",
"city": "PALO ALTO",
"state": "CA",
"postal_code": "943052200",
"telephone_number": "650-723-4000"
}
],
"practiceLocations": [],
"basic": {
"last_name": "ZASLAVSKY",
"first_name": "JUSTIN",
"middle_name": "MATTHEW",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2025-03-22",
"last_updated": "2026-08-17",
"certification_date": "2026-08-17",
"status": "A"
},
"taxonomies": [
{
"code": "208000000X",
"taxonomy_group": "",
"desc": "Pediatrics",
"state": "CA",
"license": "PTL20780",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Palo Alto, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 17, 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.