ELLEN FERRIS WILLIAMS LCSW
NPI 1710442546
Social Worker in Marshall, MN
About Ellen Ferris Williams Lcsw NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELLEN FERRIS WILLIAMS LCSW (NPI 1710442546) is an individual social worker in Marshall, Minnesota, licensed in Pennsylvania (135841) and active in the NPI registry since February 2019. She is enrolled in Medicare PECOS and is a graduate of Other (2018).
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 and accepts Medicare assignment
Ellen Ferris Williams Lcsw 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
3Medicare enrollment records show Ellen Williams reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Marshall, MN 56258
- Reassigned Medicare billing, Minnesota enrollment
- 47 clinicians in this Medicare group
Novi, MI 48375
- Reassigned Medicare billing, Michigan enrollment
- 26 clinicians in this Medicare group
Detroit, MI 48219
- Reassigned Medicare billing, Michigan enrollment
- 19 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
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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
MARSHALL, MN 56258
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 Ellen Williams's NPI number?
The NPI number for Ellen Williams is 1710442546. It was assigned to this individual provider in the NPPES registry on February 6, 2019.
Where is Ellen Williams located?
Ellen Williams practices at 1212 E College Dr, Marshall, MN 56258. The listed phone number is (507) 337-4920.
What is Ellen Williams's specialty?
The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.
Is Ellen Williams enrolled in Medicare?
Yes. Ellen Williams 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 Ellen Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Williams reassigns Medicare benefits to 3 organizations: Western Mental Health Center, Inc. (Marshall, MN), Cns Healthcare (Novi, MI) and Development Centers, Inc. (Detroit, MI). 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 Ellen Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ellen Williams accept?
Health plans from Avera Health Plans, HealthPartners, Priority Health and Sanford Health Plan list Ellen Williams 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 Ellen Williams was last updated on January 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.
# Ellen Ferris Williams, LCSW · NPI 1710442546
Social Worker provider in Marshall, Minnesota. Individual provider, active in the CMS NPPES registry since February 6, 2019.
## Identity
- **NPI:** 1710442546 (Entity type: Individual)
- **Enumerated:** February 6, 2019
- **Primary specialty:** Social Worker · taxonomy 104100000X
- **State license:** 135841 (Pennsylvania)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1212 E COLLEGE DR, Marshall, MN 56258-2713
- **Phone:** (507) 337-4920
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Western Mental Health Center, Inc. (NPI 1982613311, Marshall, MN); Cns Healthcare (NPI 1770538068, Novi, MI); Development Centers, Inc. (NPI 1326135047, Detroit, MI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** January 30, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1710442546) · Data from the CMS NPPES public registry.