Active NPI
Stephen A Massick, MD
- Obstetrics & Gynecology Physician
- Fond Du Lac, WI
National Provider Identifier
1942282298
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Obstetrics & Gynecology Physician
- License
- 17064
- Practice address
- 420 E Division St
Fond Du Lac, WI 54935-4560 - Phone
- (920) 926-8450
- NPI assigned
- Nov 14, 2005
- 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 |
|---|---|---|---|---|
| Obstetrics & Gynecology Physician | 207V00000X | 17064 | WI | Primary |
Addresses
Primary practice location
420 E Division St
Fond Du Lac, WI 54935-4560
Mailing address
420 E Division St
Fond Du Lac, WI 54935-4560
Phone (920) 926-8340
Other identifiers 5
| Identifier | Type | State | Issuer |
|---|---|---|---|
| WI0146 | Other | WI | JOHN DEERE |
| 12583 | Other | WI | DEAN |
| 31075000 | Medicaid | WI | |
| 39080723604 | Other | WI | UNITY |
| 17064 | Other | WI | TOUCHPOINT |
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
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 17064 | WI | MD | Obstetrics & Gynecology Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Agnesian Healthcare Inc | Past | Accepting new patients |
Organizations & group practices 1
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Community/Retail Pharmacy
- Waupun, WI
- NPI 1366417917
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1131926400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1942282298",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "420 E DIVISION ST",
"city": "FOND DU LAC",
"state": "WI",
"postal_code": "549354560",
"telephone_number": "920-926-8340"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "420 E DIVISION ST",
"city": "FOND DU LAC",
"state": "WI",
"postal_code": "549354560",
"telephone_number": "920-926-8450"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MASSICK",
"first_name": "STEPHEN",
"middle_name": "A",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2005-11-14",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "207V00000X",
"taxonomy_group": "",
"desc": "Obstetrics & Gynecology",
"state": "WI",
"license": "17064",
"primary": true
}
],
"identifiers": [
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "JOHN DEERE",
"identifier": "WI0146",
"state": "WI"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "DEAN",
"identifier": "12583",
"state": "WI"
},
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "31075000",
"state": "WI"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "UNITY",
"identifier": "39080723604",
"state": "WI"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "TOUCHPOINT",
"identifier": "17064",
"state": "WI"
}
],
"endpoints": [],
"other_names": []
}Other providers in Fond Du Lac, WI
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.