Active NPI
Walter John Mazzella, DDS, MS
- Dentist
- Washington, DC
National Provider Identifier
1497733463
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Dentist
- License
- DEN2174
- Practice address
- 4400 Jenifer St NW
#335
Washington, DC 20015 - Phone
- (202) 966-3132
- Fax
- (202) 966-0470
- NPI assigned
- Jan 9, 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 |
|---|---|---|---|---|
| Dentist | 122300000X | DEN2174 | DC | Primary |
Addresses
Primary practice location
4400 Jenifer St NW
#335
Washington, DC 20015
Mailing address
4400 Jenifer St NW
#335
Washington, DC 20015
Phone (202) 966-3132
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
- Master of Science
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| DEN2174 | DC | MD | Dentist |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1136764800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1497733463",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "4400 JENIFER ST NW",
"address_2": "#335",
"city": "WASHINGTON",
"state": "DC",
"postal_code": "20015",
"telephone_number": "202-966-3132",
"fax_number": "202-966-0470"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "4400 JENIFER ST NW",
"address_2": "#335",
"city": "WASHINGTON",
"state": "DC",
"postal_code": "20015",
"telephone_number": "202-966-3132",
"fax_number": "202-966-0470"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MAZZELLA",
"first_name": "WALTER",
"middle_name": "JOHN",
"credential": "DDS, MS",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2006-01-09",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "122300000X",
"taxonomy_group": "",
"desc": "Dentist",
"state": "DC",
"license": "DEN2174",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Washington, DC
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.