NPPES file of Aug 9, 2026

Sydney R. Mittnacht, NP

Nurse Practitioner · Greenfield, WI

Sydney R. Mittnacht, NP is a nurse practitioner with a practice address in Greenfield, Wisconsin, and NPI 1578387940, issued on Nov 13, 2024. Check the license (Wisconsin 15557-33, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1578387940
Name
Sydney R. Mittnacht
Credential
NP
Primary taxonomy
Nurse Practitioner 363L00000X
License number
15557-33 WI
Self-reported in NPPES; status is on the state search
Practice location
6901 W Edgerton Ave, Greenfield, WI 53220
Phone
(414) 421-8400
Enumerated
Nov 13, 2024
Record last updated
Feb 13, 2025
Medicaid ID
100297469 WI
Medicare enrollment
Enrolled (PECOS I20241205002868); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest nurse practitioner records → All 3,995 in Wisconsin → Look up another NPI →

Also registered at 6901 W Edgerton Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Emily AkulaPhysician Assistant1144922386
  2. David Arendt, MD, PHDPediatrics Physician1194306381
  3. James Bode, APRN-BCNurse Practitioner1457373276
  4. Rica Canseco, MDFamily Medicine Physician1538348537
  5. Gina Centeno, MS, PA-CPhysician Assistant1689952426
  6. Shahzad Chaudhry, MDFamily Medicine Physician1457745630

Verify Sydney R. Mittnacht in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
    Search for license 15557-33    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Wisconsin license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Aurora Medical Group, Inc.West Allis, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Sydney R. Mittnacht among 3,995 nurse practitioner records in Wisconsin

Sydney R. Mittnacht, NP is one of 3,995 nurse practitioner records with a practice address in Wisconsin. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2024, is newer than 90% of them.

  • NPI issued2024 · 90% of these records are older, 5% newer
  • In a Medicare fileYes · 77% of these records are
  • In the CMS Doctors and Clinicians fileYes · 68% of these records are
  • Graduated2023 · median 2017 among the 2,701 with a school on file
  • Record last updated2025 · 41% 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

48 nurse practitioner records list a practice address in Greenfield

They are 48 of the 961 NPPES records with a practice address in Greenfield, and 3,995 nurse practitioner records in Wisconsin.

All 3,995 in Wisconsin → Every provider in Greenfield → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Della Alvarez, APNPMilwaukee, WI 532201316089477
  2. James Bode, APRN-BCGreenfield, WI 532201457373276
  3. Jodi Dreier, APNPMilwaukee, WI 532201588725436
  4. James Ehlers, APNPMilwaukee, WI 532201750496873
  5. Janice Gregory, NPGreenfield, WI 532201184674723
  6. Susan Hafemann, APNPGreenfield, WI 532201013166768
  7. Angela King, NPGreenfield, WI 532201417338351
  8. Kathleen Krickeberg, NPGreenfield, WI 532201366810020

Common questions

What is Sydney R. Mittnacht, NP's NPI number?

Sydney R. Mittnacht, NP's National Provider Identifier (NPI) is 1578387940, issued on Nov 13, 2024. An NPI identifies a provider in billing; it is not a license.

Where is Sydney R. Mittnacht, NP located?

The NPPES record lists a practice address at 6901 W Edgerton Ave, Greenfield, WI, 53220. Phone: (414) 421-8400. Providers update this record themselves, so call before visiting.

How can I verify Sydney R. Mittnacht, NP's license?

NPPES lists Wisconsin license number 15557-33, as entered by the provider. Search the Wisconsin 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.