Mary Zielke, FNP
NPI 1467841338 · Nurse Practitioner · Jacksonville, IL
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Zielke, FNP is a Nurse Practitioner provider in Jacksonville, IL (NPI 1467841338).
Provider details
- NPI number
- 1467841338
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Female
- Sole proprietor
- No
- License
- 209012398 (IL)
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 tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
169 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 169 | $103 |
Typical Medicare-allowed amounts for these services range $103–$103 (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 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluoxetine Hcl | 122 | 11 |
| Sertraline Hcl | 111 | 16 |
| Quetiapine Fumarate | 100 | 12 |
| Risperidone | 92 | — |
| Duloxetine Hcl | 90 | 11 |
| Aripiprazole | 78 | 11 |
| Escitalopram Oxalate | 78 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-01-15
- Last updated
- 2020-06-18
- Certified
- 2020-06-18
Frequently asked questions
- What is Mary Zielke's NPI number?
- Mary Zielke's National Provider Identifier (NPI) is 1467841338, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Zielke's specialty?
- Mary Zielke is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Zielke located?
- Mary Zielke's practice location on file with NPPES is 1600 W Walnut St, Jacksonville, IL 62650-1136.
- What is Mary Zielke's phone number?
- The practice phone number listed in the NPPES registry for Mary Zielke is (217) 245-7275.
- Does Mary Zielke accept Medicare?
- Mary Zielke is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Zielke's NPI active?
- Yes — Mary Zielke's NPI (1467841338) is active in the NPPES registry as of the last update on 2020-06-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.