Mary E. Wassilak, WHNP-BC
Nurse Practitioner · Geneva, IL
Mary E. Wassilak, WHNP-BC is a nurse practitioner with a practice address in Geneva, Illinois, and NPI 1811138944, issued on Mar 19, 2009. Check the license (Illinois 209006774, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary E. Wassilak
- Credential
- WHNP-BC
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License numbers
- 209006774 IL
209.006774 IL
Self-reported in NPPES; status is on the state search - Practice location
- 351 Delnor Dr Ste 204, Geneva, IL 60134
- Phone
- (630) 208-0784
- Enumerated
- Mar 19, 2009
- Record last updated
- Oct 6, 2023
- Fax
- (630) 938-9190
- Medicare enrollment
- Enrolled (PECOS I20230824003206); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 2007
- Entity
- Type 1 · individual
Also registered at 351 Delnor Dr Ste 204
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aprilee Gostomski, MDObstetrics Physician1457872400
- Michael Larry, M. D.Obstetrics & Gynecology Physician1164433348
- Jonathan Song, M.D.Obstetrics & Gynecology Physician1851452775
Verify Mary E. Wassilak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 209006774Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $102.91
1 payment: food and beverage; the largest payer was Astellas Pharma US Inc. The 38,884 providers of this specialty with any payment received $791.64 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Central Dupage Physician GroupGeneva, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
35 nurse practitioner records list a practice address in Geneva
They are 35 of the 1,023 NPPES records with a practice address in Geneva, and 4,892 nurse practitioner records in Illinois.
All 35 in Geneva → All 4,892 in Illinois → Every provider in Geneva →
Other nurse practitioner records in Illinois
- Janice Abadilla, FNP-BCPeoria, IL1548157175
- Philomena AbebePark Ridge, IL1902780174
- Milagros Abellera, APNChicago, IL1528076239
- Edwina Abloh, APN-CNPSkokie, IL1689314098
- Sandra Abraham, CNPDwight, IL1982883245
- Sharon Abraham, APN-CNPArlington Heights, IL1396485884
- Hazel Acacio, APNPWauconda, IL1205471679
- Anthony Aceto, APRN, FNP-CSchaumburg, IL1891302956
- Francisco Acevedo, APRN, CNPMokena, IL1467446930
- Mina Acevedo, APRNGlenview, IL1972174688
Common questions
What is Mary E. Wassilak, WHNP-BC's NPI number?
Mary E. Wassilak, WHNP-BC's National Provider Identifier (NPI) is 1811138944, issued on Mar 19, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Mary E. Wassilak, WHNP-BC located?
The NPPES record lists a practice address at 351 Delnor Dr Ste 204, Geneva, IL, 60134. Phone: (630) 208-0784. Providers update this record themselves, so call before visiting.
How can I verify Mary E. Wassilak, WHNP-BC's license?
NPPES lists Illinois license number 209006774, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.