SHAWN S WILLIAMSON M.D.
NPI 1386808319
Emergency Medicine in New London, WI
About Shawn S Williamson M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SHAWN S WILLIAMSON M.D. (NPI 1386808319) is an individual emergency medicine provider in New London, Wisconsin, licensed in Wisconsin (53739-20) and active in the NPI registry since July 2008. He is enrolled in Medicare PECOS and maintains a secondary practice location in Appleton.
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 (PECOS)
Shawn S Williamson M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
6Medicare enrollment records show Shawn Williamson reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New London, WI 54961
- Reassigned Medicare billing, Wisconsin enrollment
- 56 clinicians in this Medicare group
Waupaca, WI 54981
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1013995521 (Wisconsin)
- 110 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
- 174 clinicians in this Medicare group
Wild Rose, WI 54984
- Reassigned Medicare billing, Wisconsin enrollment
- 42 clinicians in this Medicare group
Berlin, WI 54923
- Reassigned Medicare billing, Wisconsin enrollment
- 104 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 54961 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.
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 Shawn Williamson's NPI number?
The NPI number for Shawn Williamson is 1386808319. It was assigned to this individual provider in the NPPES registry on July 18, 2008.
Where is Shawn Williamson located?
Shawn Williamson practices at 1405 Mill St, New London, WI 54961. The listed phone number is (920) 531-2021.
What is Shawn Williamson's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Shawn Williamson enrolled in Medicare?
Yes. Shawn Williamson is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Shawn Williamson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Shawn Williamson reassigns Medicare benefits to 6 organizations: Thedacare Medical Center - New London, Inc. (New London, WI), Thedacare Medical Center - Waupaca, Inc. (Waupaca, WI), Thedacare Regional Medical Center - Appleton, Inc. (Appleton, WI), Thedacare Medical Center - Shawano, Inc. (Shawano, WI), Thedacare Medical Center - Wild Rose, Inc (Wild Rose, WI) and 1 more organization, 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 Shawn Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Shawn Williamson accept?
Health plans from CareSource (Common Ground Healthcare) list Shawn Williamson 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 Shawn Williamson was last updated on June 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Shawn S Williamson, M.D. · NPI 1386808319
Emergency Medicine physician in New London, Wisconsin. Individual provider, active in the CMS NPPES registry since July 18, 2008.
## Identity
- **NPI:** 1386808319 (Entity type: Individual)
- **Enumerated:** July 18, 2008
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 53739-20 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1405 MILL ST, New London, WI 54961-2155
- **Phone:** (920) 531-2021
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Thedacare Medical Center - New London, Inc. (NPI 1538127220, New London, WI); Thedacare Medical Center - Waupaca, Inc. (NPI 1780782680, Waupaca, WI); Thedacare Regional Medical Center - Appleton, Inc. (NPI 1902832306, Appleton, WI); Thedacare Medical Center - Shawano, Inc. (NPI 1548260839, Shawano, WI); Thedacare Medical Center - Wild Rose, Inc (NPI 1043263999, Wild Rose, WI); and 1 more · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 21, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1386808319) · Data from the CMS NPPES public registry.