SARAH WALDER APNP
NPI 1912234881
Nurse Practitioner - Neonatal in Wausau, WI
About Sarah Walder Apnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SARAH WALDER APNP (NPI 1912234881) is an individual neonatal provider in Wausau, Wisconsin, licensed in Wisconsin (3914) and active in the NPI registry since November 2009. She is enrolled in Medicare PECOS and is a graduate of Rush Medical College Of Rush University (2009).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Sarah Walder Apnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Sarah Walder reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Wausau, WI 54401
- Reassigned Medicare billing, Wisconsin enrollment
- 633 clinicians in this Medicare group
Glendale, WI 53212
- Reassigned Medicare billing, Wisconsin enrollment
- 1,343 clinicians in this Medicare group
Medford, OR 97504
- Reassigned Medicare billing, Oregon enrollment
- 353 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54401 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
WAUSAU, WI 54401
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Sarah Walder's NPI number?
The NPI number for Sarah Walder is 1912234881. It was assigned to this individual provider in the NPPES registry on November 12, 2009.
Where is Sarah Walder located?
Sarah Walder practices at 2720 Plaza Dr Suite 2100, Wausau, WI 54401. The listed phone number is (715) 847-2911.
What is Sarah Walder's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Neonatal, with taxonomy code 363LN0000X.
Is Sarah Walder enrolled in Medicare?
Yes. Sarah Walder is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Sarah Walder's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sarah Walder reassigns Medicare benefits to 3 organizations: Aspirus Wausau Hospital Inc (Wausau, WI), Ascension Medical Group-Southeast Wisconsin Inc (Glendale, WI) and Asante Physician Partners (Medford, OR). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Sarah Walder's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sarah Walder accept?
Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, HealthPartners and Security Health Plan list Sarah Walder as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Sarah Walder was last updated on November 12, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 years 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.
# Sarah Walder, APNP · NPI 1912234881
Neonatal physician in Wausau, Wisconsin. Individual provider, active in the CMS NPPES registry since November 12, 2009.
## Identity
- **NPI:** 1912234881 (Entity type: Individual)
- **Enumerated:** November 12, 2009
- **Primary specialty:** Nurse Practitioner - Neonatal · taxonomy 363LN0000X
- **State license:** 3914 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 2720 PLAZA DR, SUITE 2100, Wausau, WI 54401-4158
- **Phone:** (715) 847-2911
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Aspirus Wausau Hospital Inc (NPI 1548590821, Wausau, WI); Ascension Medical Group-Southeast Wisconsin Inc (NPI 1609881077, Glendale, WI); Asante Physician Partners (NPI 1922381326, Medford, OR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Rush Medical College Of Rush University, class of 2009
## Record status
- **NPPES last updated:** November 12, 2009
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Source: [NPI Profile](https://npiprofile.com/npi/1912234881) · Data from the CMS NPPES public registry.