Active NPI
Benjamin Milzer, DO
- Internal Medicine Physician
- Milwaukee, WI
National Provider Identifier
1689429888
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Internal Medicine Physician
- License
- 8209421
- Practice address
- 945 N 12TH St
Milwaukee, WI 53233-1305 - Phone
- (414) 219-7136
- NPI assigned
- Apr 22, 2024
- 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 |
|---|---|---|---|---|
| Internal Medicine Physician | 207R00000X | 8209421 | WI | Primary |
Addresses
Primary practice location
945 N 12TH St
Milwaukee, WI 53233-1305
Mailing address
S40W22790 Sommers Hills Dr
Waukesha, WI 53189-8028
Phone (262) 617-4548
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 Osteopathy
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 8209421 | WI | MD | Internal Medicine Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1713744000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1769472000000",
"number": "1689429888",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "S40W22790 SOMMERS HILLS DR",
"city": "WAUKESHA",
"state": "WI",
"postal_code": "531898028",
"telephone_number": "262-617-4548"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "945 N 12TH ST",
"city": "MILWAUKEE",
"state": "WI",
"postal_code": "532331305",
"telephone_number": "414-219-7136"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MILZER",
"first_name": "BENJAMIN",
"credential": "DO",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2024-04-22",
"last_updated": "2026-01-27",
"certification_date": "2026-01-27",
"status": "A"
},
"taxonomies": [
{
"code": "207R00000X",
"taxonomy_group": "",
"desc": "Internal Medicine",
"state": "WI",
"license": "8209421",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Milwaukee, WI
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 27, 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.