Mrs. Cornelia B Masak, RN, APNP
Mrs. Cornelia B Masak is a Nurse Practitioner provider (Nurse Practitioner) practicing in Appleton, WI, registered in the NPPES registry with NPI 1740319516 since 2007. The credential RN stands for Registered Nurse.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1740319516 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Mrs. Cornelia B Masak |
| Credential | RN, APNP |
| Sex | Female |
| Practice address | 1818 N MEADE ST, Appleton, WI, 54911 |
| Phone | 9207494000 |
| Fax | 9207494015 |
| Enumeration date | 2007-03-05 |
| Last updated in NPPES | 2022-11-23 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 363L00000X | Nurse Practitioner | Primary | 93688 | WI |
RN — Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN credential
Copy-ready billing details
Provider: Cornelia Masak, RN, APNP NPI: 1740319516 Taxonomy: 363L00000X (Nurse Practitioner) Address: 1818 N MEADE ST, Appleton, WI, 54911
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1588666853 | Appleton Emergency Services S C | Organization | Emergency Medicine Physician | Appleton, WI |
| 1689679953 | Michael Hooker | Individual | Hospitalist Physician | Appleton, WI |
| 1346249323 | Honnie Bermas | Individual | Surgery Physician | Appleton, WI |
| 1306846894 | Steven Mcintyre | Individual | Emergency Medical Services (Emergency Medicine) Physician | Appleton, WI |
| 1194725879 | Cyril Walsh | Individual | Emergency Medical Services (Emergency Medicine) Physician | Appleton, WI |
| 1558361238 | Sharon Thorson | Individual | Family Nurse Practitioner | Appleton, WI |
| 1902806698 | Brad Sandleback | Individual | Emergency Medical Services (Emergency Medicine) Physician | Appleton, WI |
| 1831199439 | Craig Quandt-Walle | Individual | Medical Physician Assistant | Appleton, WI |
Verify this record
Cross-check NPI 1740319516 against the authoritative CMS record: view Mrs. Cornelia B Masak on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Where does Cornelia Masak practice?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2022-11-23.