SPENCER RILEY GANTZ
NPI 1639600547
Obstetrics & Gynecology in Appleton, WI
About Spencer Riley Gantz NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SPENCER RILEY GANTZ (NPI 1639600547) is an individual obstetrics & gynecology provider in Appleton, Wisconsin, licensed in Wisconsin (70641-20) and active in the NPI registry since March 2017. He is enrolled in Medicare PECOS, is affiliated with Thedacare Regional Med Ctr - Neenah, and maintains a secondary practice location in Milwaukee.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Spencer Riley Gantz is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Spencer Gantz reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Appleton, WI 54911
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Womens Health Specialists Sc
- 25 clinicians in this Medicare group
Neenah, WI 54956
- Reassigned Medicare billing, Wisconsin enrollment
- 444 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Thedacare Regional Med Ctr - Neenah
Acute Care Hospitals · Neenah, WIThedacare Regional Medical Center - Appleton Inc
Acute Care Hospitals · Appleton, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54911 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 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
APPLETON, WI 54911
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 Spencer Gantz's NPI number?
The NPI number for Spencer Gantz is 1639600547. It was assigned to this individual provider in the NPPES registry on March 22, 2017.
Where is Spencer Gantz located?
Spencer Gantz practices at 1818 N Meade St Ste 330, Appleton, WI 54911. The listed phone number is (920) 749-4000.
What is Spencer Gantz's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Spencer Gantz enrolled in Medicare?
Yes. Spencer Gantz is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Spencer Gantz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Spencer Gantz reassigns Medicare benefits to 2 organizations: Women's Health Specialists, S.C. (Appleton, WI) and Ascension Medical Group-Fox Valley Wisconsin, Inc (Neenah, WI). 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 Spencer Gantz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Spencer Gantz accept?
Health plans from Aspirus Health Plan, CareSource (Common Ground Healthcare), Dean Health Plan, HealthPartners and Network Health and 2 other insurers list Spencer Gantz 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.
Is Spencer Gantz affiliated with any hospitals?
According to CMS data, Spencer Gantz is affiliated with Thedacare Regional Med Ctr - Neenah and Thedacare Regional Medical Center - Appleton Inc.
When was this NPI record last updated?
The NPPES record for Spencer Gantz was last updated on November 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 months 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.
# Spencer Riley Gantz · NPI 1639600547
Obstetrics & Gynecology physician in Appleton, Wisconsin. Individual provider, active in the CMS NPPES registry since March 22, 2017.
## Identity
- **NPI:** 1639600547 (Entity type: Individual)
- **Enumerated:** March 22, 2017
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 70641-20 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1818 N MEADE ST STE 330, Appleton, WI 54911-3454
- **Phone:** (920) 749-4000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Women's Health Specialists, S.C. (NPI 1417086216, Appleton, WI); Ascension Medical Group-Fox Valley Wisconsin, Inc (NPI 1730126392, Neenah, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2017
## Record status
- **NPPES last updated:** November 21, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1639600547) · Data from the CMS NPPES public registry.