Active NPI
Sylvia W Warren, DO
- General Practice Physician
- Wauwatosa, WI
National Provider Identifier
1992880918
On this page
Key facts
NPPES NPI Registry- Primary specialty
- General Practice Physician
- License
- 35363
- Practice address
- 11803 W North Ave
Wauwatosa, WI 53226 - Phone
- (414) 258-5522
- Fax
- (414) 258-1337
- NPI assigned
- Oct 26, 2006
- Sex
- Female
- 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 |
|---|---|---|---|---|
| General Practice Physician | 208D00000X | 35363 | WI | Primary |
Addresses
Primary practice location
11803 W North Ave
Wauwatosa, WI 53226
Mailing address
4208 N 74TH St
Milwaukee, WI 53216
Phone (414) 463-0829
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 30062700 | Medicaid | WI |
Other names 1
- Sylvia Dieffenbach
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 Osteopathy
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 35363 | WI | MD | General Practice Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1161820800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1788652800000",
"number": "1992880918",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "4208 N 74TH ST",
"city": "MILWAUKEE",
"state": "WI",
"postal_code": "53216",
"telephone_number": "414-463-0829"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "11803 W NORTH AVE",
"city": "WAUWATOSA",
"state": "WI",
"postal_code": "53226",
"telephone_number": "414-258-5522",
"fax_number": "414-258-1337"
}
],
"practiceLocations": [],
"basic": {
"last_name": "WARREN",
"first_name": "SYLVIA",
"middle_name": "W",
"name_prefix": "Dr.",
"credential": "DO",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2006-10-26",
"last_updated": "2026-09-06",
"status": "A"
},
"taxonomies": [
{
"code": "208D00000X",
"taxonomy_group": "",
"desc": "General Practice",
"state": "WI",
"license": "35363",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "30062700",
"state": "WI"
}
],
"endpoints": [],
"other_names": [
{
"first_name": "SYLVIA",
"last_name": "DIEFFENBACH",
"code": "5",
"type": "Other Name"
}
]
}Other providers in Wauwatosa, WI
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 6, 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.