Mary K. Zielke, FNP
Nurse Practitioner · Jacksonville, IL
Mary K. Zielke, FNP is a nurse practitioner with a practice address in Jacksonville, Illinois, and NPI 1467841338, issued on Jan 15, 2015. Check the license (Illinois 209012398, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary K. Zielke
- Credential
- FNP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 209012398 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1600 W Walnut St, Jacksonville, IL 62650
- Phone
- (217) 245-7275
- Enumerated
- Jan 15, 2015
- Record last updated
- Jun 18, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 209012398 IL
- Medicare enrollment
- Enrolled (PECOS I20250409000278); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 4,892 in Illinois → Look up another NPI →
Also registered at 1600 W Walnut St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Dennis Backstrom, MDEmergency Medicine Physician1497892012
- Katie BarrettCertified Registered Nurse Anesthetist1487235321
- Matthew Bednarchik, CRNACertified Registered Nurse Anesthetist1124391552
- Ladonna Bryan, MDSurgery Physician1508975285
Verify Mary K. Zielke in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 209012398Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% more Medicare Part D claims than the average nurse practitioner in 2024
1,620 Medicare Part D claims for 102 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Fluoxetine Hcl122 claims
- Sertraline Hcl111 claims
- Quetiapine Fumarate100 claims
- Risperidone92 claims
- Duloxetine Hcl90 claims
- Aripiprazole78 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
- South Central Missouri Community Health CenterRolla, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary K. Zielke among 4,892 nurse practitioner records in Illinois
Mary K. Zielke, FNP 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 2015, is newer than 31% of them.
- NPI issued2015 · 31% of these records are older, 64% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2020 · median 2018 among the 3,389 with a school on file
- Record last updated2020 · 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).
10 nurse practitioner records list a practice address in Jacksonville
They are 10 of the 315 NPPES records with a practice address in Jacksonville, and 4,892 nurse practitioner records in Illinois.
All 4,892 in Illinois → Every provider in Jacksonville → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Brandynne Allgaier, FNP-C, APRNJacksonville, IL 626501477225993
- Jeanine Bohan, CERTIFIED NURSE PRACJacksonville, IL 626501497191373
- Jennifer Flinn, FNPJacksonville, IL 626501932174133
- Maurissa Heaton, APRNJacksonville, IL 626501649968660
- Sondra Hoover, APNJacksonville, IL 626501538368568
- Megan Hopps, APRNJacksonville, IL 626501679119226
- Donna Leischner, CERTIFIED NURSE PRACJacksonville, IL 626501124464094
- Kathleen Stocker, APRNJacksonville, IL 626501306949375
Common questions
What is Mary K. Zielke, FNP's NPI number?
Mary K. Zielke, FNP's National Provider Identifier (NPI) is 1467841338, issued on Jan 15, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Mary K. Zielke, FNP located?
The NPPES record lists a practice address at 1600 W Walnut St, Jacksonville, IL, 62650. Phone: (217) 245-7275. Providers update this record themselves, so call before visiting.
How can I verify Mary K. Zielke, FNP's license?
NPPES lists Illinois license number 209012398, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Mary K. Zielke, FNP prescribe under Medicare Part D?
In 2024, Mary K. Zielke, FNP had 1,620 Medicare Part D claims for 102 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.