Sydney Mittnacht, NP
NPI 1578387940 · Nurse Practitioner · Greenfield, WI
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sydney Mittnacht, NP is a Nurse Practitioner provider in Greenfield, WI (NPI 1578387940).
Provider details
- NPI number
- 1578387940
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 15557-33 (WI)
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 tenure38% of score
1 yr in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2024-11-13
- Last updated
- 2025-02-13
- Certified
- 2025-02-13
Frequently asked questions
- What is Sydney Mittnacht's NPI number?
- Sydney Mittnacht's National Provider Identifier (NPI) is 1578387940, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sydney Mittnacht's specialty?
- Sydney Mittnacht is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Sydney Mittnacht located?
- Sydney Mittnacht's practice location on file with NPPES is 6901 W Edgerton Ave, Greenfield, WI 53220-4420.
- What is Sydney Mittnacht's phone number?
- The practice phone number listed in the NPPES registry for Sydney Mittnacht is (414) 421-8400.
- Does Sydney Mittnacht accept Medicare?
- Sydney Mittnacht is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sydney Mittnacht's NPI active?
- Yes — Sydney Mittnacht's NPI (1578387940) is active in the NPPES registry as of the last update on 2025-02-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.