DR. SPENCER WOLF GREAVES MD
NPI 1457844102
Emergency Medicine in Waupaca, WI
About Dr. Spencer Wolf Greaves Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SPENCER WOLF GREAVES MD (NPI 1457844102) is an individual emergency medicine provider in Waupaca, Wisconsin, licensed in Wisconsin (76902-20) and active in the NPI registry since June 2018. He is enrolled in Medicare PECOS, is affiliated with Thedacare Medical Center - New London, and maintains a secondary practice location in Eau Claire.
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
Dr. Spencer Wolf Greaves Md 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
7Medicare enrollment records show Spencer Greaves reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Waupaca, WI 54981
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1013995521 (Wisconsin)
- 110 clinicians in this Medicare group
Wild Rose, WI 54984
- Reassigned Medicare billing, Wisconsin enrollment
- 28 clinicians in this Medicare group
New London, WI 54961
- Reassigned Medicare billing, Wisconsin enrollment
- 56 clinicians in this Medicare group
Wautoma, WI 54982
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1760413777 (Wisconsin)
- 55 clinicians in this Medicare group
Appleton, WI 54911
- Reassigned Medicare billing, Wisconsin enrollment
- 35 clinicians in this Medicare group
Shawano, WI 54166
- Reassigned Medicare billing, Wisconsin enrollment
- 70 clinicians in this Medicare group
Beaver Dam, WI 53916
- Reassigned Medicare billing, Wisconsin enrollment
- 32 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.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Thedacare Medical Center - New London
Critical Access Hospitals · New London, WIThedacare Medical Center-Waupaca
Critical Access Hospitals · Waupaca, WIThedacare Medical Center - Shawano
Critical Access Hospitals · Shawano, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54981 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.
WAUPACA, WI 54981
WAUPACA, WI 54981
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 Greaves's NPI number?
The NPI number for Spencer Greaves is 1457844102. It was assigned to this individual provider in the NPPES registry on June 7, 2018.
Where is Spencer Greaves located?
Spencer Greaves practices at 800 Riverside Dr, Waupaca, WI 54981. The listed phone number is (715) 258-1000.
What is Spencer Greaves's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Spencer Greaves enrolled in Medicare?
Yes. Spencer Greaves 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 Greaves's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Spencer Greaves reassigns Medicare benefits to 7 organizations: Thedacare Medical Center - Waupaca, Inc. (Waupaca, WI), Thedacare Medical Center - Wild Rose, Inc (Wild Rose, WI), Thedacare Medical Center - New London, Inc. (New London, WI), Thedacare Medical Center - Berlin, Inc. (Wautoma, WI), Thedacare Regional Medical Center - Appleton, Inc. (Appleton, WI) and 2 more organizations, listed in the Medicare section above. 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 Greaves's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Spencer Greaves accept?
Health plans from CareSource (Common Ground Healthcare) list Spencer Greaves 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 Greaves affiliated with any hospitals?
According to CMS data, Spencer Greaves is affiliated with Thedacare Medical Center - New London, Thedacare Medical Center-Waupaca and Thedacare Medical Center - Shawano.
When was this NPI record last updated?
The NPPES record for Spencer Greaves was last updated on April 30, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Dr. Spencer Wolf Greaves, MD · NPI 1457844102
Emergency Medicine physician in Waupaca, Wisconsin. Individual provider, active in the CMS NPPES registry since June 7, 2018.
## Identity
- **NPI:** 1457844102 (Entity type: Individual)
- **Enumerated:** June 7, 2018
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 76902-20 (Wisconsin)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 800 RIVERSIDE DR, Waupaca, WI 54981-1943
- **Phone:** (715) 258-1000
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Thedacare Medical Center - Waupaca, Inc. (NPI 1780782680, Waupaca, WI); Thedacare Medical Center - Wild Rose, Inc (NPI 1043263999, Wild Rose, WI); Thedacare Medical Center - New London, Inc. (NPI 1538127220, New London, WI); Thedacare Medical Center - Berlin, Inc. (NPI 1992159289, Wautoma, WI); Thedacare Regional Medical Center - Appleton, Inc. (NPI 1902832306, Appleton, WI); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Medical College Of Wisconsin, class of 2018
## Record status
- **NPPES last updated:** April 30, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1457844102) · Data from the CMS NPPES public registry.