Maria E. Onak, APN-CNP
Nurse Practitioner · Glenview, IL
Maria E. Onak, APN-CNP is a nurse practitioner with a practice address in Glenview, Illinois, and NPI 1700074754, issued on Oct 3, 2007. Check the license (Illinois 209006771, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Maria E. Onak
- Credential
- APN-CNP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 209006771 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2100 Pfingsten RD, Glenview, IL 60026
- Phone
- (847) 503-4222
- Enumerated
- Oct 3, 2007
- Record last updated
- May 5, 2026
- Fax
- (847) 503-5110
- Medicare enrollment
- Enrolled (PECOS I20071220000365); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 2007
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 4,892 in Illinois → Look up another NPI →
Also registered at 2100 Pfingsten RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ermilo Barrera, MDSurgery Physician1447327192
Verify Maria E. Onak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 209006771Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average nurse practitioner in 2024
169 Medicare Part D claims for 23 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D.
Most prescribed
- Gabapentin40 claims
- Desipramine Hcl26 claims
- Mirtazapine21 claims
- Dicyclomine Hcl13 claims
- Ondansetron Hcl12 claims
- Pantoprazole Sodium12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Endeavor Health Medical GroupEvanston, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Maria E. Onak among 4,892 nurse practitioner records in Illinois
Maria E. Onak, APN-CNP is one of 4,892 nurse practitioner records with a practice address in Illinois. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 11% of them.
- NPI issued2007 · 11% of these records are older, 85% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2007 · median 2018 among the 3,389 with a school on file
- Record last updated2026 · 36% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
73 nurse practitioner records list a practice address in Glenview
They are 73 of the 2,545 NPPES records with a practice address in Glenview, and 4,892 nurse practitioner records in Illinois.
All 4,892 in Illinois → Every provider in Glenview → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Amanda Cuca, APRN, CNPGlenview, IL 600261033462643
- Jamia Galton, APNGlenview, IL 600261558629576
- Elsa Garza, APN-CNPGlenview, IL 600261457581373
- Rebecca Herlitz, ACNP-BCGlenview, IL 600261942462973
- Margaret Keller, APN-CNPGlenview, IL 600261063742963
- Danbee Kwon, APN-CNPGlenview, IL 600261932536703
- Katherine Marchese, APNGlenview, IL 600261972663672
- Susan McMillan, NPGlenview, IL 600261487099644
Common questions
What is Maria E. Onak, APN-CNP's NPI number?
Maria E. Onak, APN-CNP's National Provider Identifier (NPI) is 1700074754, issued on Oct 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Maria E. Onak, APN-CNP located?
The NPPES record lists a practice address at 2100 Pfingsten RD, Glenview, IL, 60026. Phone: (847) 503-4222. Providers update this record themselves, so call before visiting.
How can I verify Maria E. Onak, APN-CNP's license?
NPPES lists Illinois license number 209006771, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Maria E. Onak, APN-CNP prescribe under Medicare Part D?
In 2024, Maria E. Onak, APN-CNP had 169 Medicare Part D claims for 23 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions 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.