Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

SIERRA R GUENTHER MSN, FNP
NPI 1316869407
Nurse Practitioner - Family in Appleton, WI

Q: What is Sierra Guenther's NPI number?

The NPI number for Sierra Guenther is 1316869407. It was assigned to this individual provider in the NPPES registry on July 29, 2026.

Q: What is Sierra Guenther's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Q: When was this NPI record last updated?

The NPPES record for Sierra Guenther was last updated on October 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since July 29, 2026PECOS Enrolled

3925 N GATEWAY DR, APPLETON, WI 54913(920) 205-0279 Get Directions Write a Review

NPPES record last updated: October 1, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Oct 1, 2026, Jul 29, 2026 (2 updates tracked since 2026).

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About Sierra R Guenther Msn, Fnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SIERRA R GUENTHER MSN, FNP (NPI 1316869407) is an individual family provider in Appleton, Wisconsin, licensed in Wisconsin (18624) and active in the NPI registry since July 2026. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1316869407

Entity TypeIndividualFemale

Primary Taxonomy363LF0000X

Provider Legal NameSIERRA R GUENTHERCredential: MSN, FNP

Location Address3925 N GATEWAY DRAppleton, WI 54913-7863

Mailing Address3 Neenah CtrNeenah, WI 54956-3070 · (920) 830-5900 · Fax (920) 830-5910

Phone(920) 205-0279

Sole ProprietorNo

Enumeration DateJuly 29, 2026

Last NPPES UpdateOctober 1, 20262 updates tracked since enumeration

NPPES CertifiedOctober 1, 2026

✔ NPI 1316869407 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LF0000X

License✔ Licensed in WI · 18624

3925 N GATEWAY DR, Appleton, WI 54913

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Sierra R Guenther Msn, Fnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 54913 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$82.92 typical visit price

range $53.90 – $163.24

Typical copayment $20.73 (range $13.47 – $40.81)

Most-billed visit code 99203

Established Patient

$95.41 typical visit price

range $17.40 – $133.76

Typical copayment $23.85 (range $4.35 – $33.44)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

FOX VALLEY HEMATOLOGY & ONCOLOGY S C

Pharmacy (Community/Retail Pharmacy)

3925 N GATEWAY DR, SUITE 100
APPLETON, WI 54913

Outagamie County (920) 702-4802

BRITTANY E GOODRICH-BRAUN

Family Medicine