Cornelia Masak, RN, APNP
NPI 1740319516 · Nurse Practitioner · Appleton, WI
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cornelia Masak, RN, APNP is a Nurse Practitioner provider in Appleton, WI (NPI 1740319516).
Provider details
- NPI number
- 1740319516
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN, APNP
- Sex
- Female
- Sole proprietor
- No
- License
- 93688 (WI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
56 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 41 | $72 |
| Cervical Or Vaginal Cancer Screening; Pelvic and Clinical Breast ExaminationG0101 | 15 | $31 |
Typical Medicare-allowed amounts for these services range $31–$72 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Estradiol | 72 | 25 |
| Fluconazole | 26 | 16 |
| Valacyclovir Hclbrand: Valacyclovir | 24 | — |
| Sertraline Hcl | 23 | — |
| Norgestrel-Ethinyl Estradiolbrand: Cryselle | 18 | — |
| Clotrimazole/Betamethasone Dipbrand: Clotrimazole-Betamethasone | 13 | 13 |
| Progesterone, Micronizedbrand: Progesterone | 13 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$291 across 15 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-05
- Last updated
- 2022-11-23
- Certified
- 2022-11-23
Frequently asked questions
- What is Cornelia Masak's NPI number?
- Cornelia Masak's National Provider Identifier (NPI) is 1740319516, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cornelia Masak's specialty?
- Cornelia Masak is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Cornelia Masak located?
- Cornelia Masak's practice location on file with NPPES is 1818 N Meade St, Appleton, WI 54911-3454.
- What is Cornelia Masak's phone number?
- The practice phone number listed in the NPPES registry for Cornelia Masak is (920) 749-4000.
- Does Cornelia Masak accept Medicare?
- Cornelia Masak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cornelia Masak's NPI active?
- Yes — Cornelia Masak's NPI (1740319516) is active in the NPPES registry as of the last update on 2022-11-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.