EILEEN KOLLMER MILLS
NPI 1336520477
Counselor - Mental Health in Acton, MA
About Eileen Kollmer Mills NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
EILEEN KOLLMER MILLS (NPI 1336520477) is an individual mental health provider in Acton, Massachusetts and active in the NPI registry since June 2015. She is enrolled in Medicare PECOS and is a graduate of Other (2016).
NPPES Registry Identity
Specialties & Licenses
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
Eileen Kollmer Mills 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 Reassignment
Medicare enrollment records show Eileen Mills reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Salem, MA 01970
- Reassigned Medicare billing, Massachusetts enrollment
- 40 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.
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 Eileen Mills's NPI number?
The NPI number for Eileen Mills is 1336520477. It was assigned to this individual provider in the NPPES registry on June 15, 2015.
Where is Eileen Mills located?
Eileen Mills practices at 360 Massachusetts Ave, Acton, MA 01720. The listed phone number is (978) 263-3427.
What is Eileen Mills's specialty?
The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.
Is Eileen Mills enrolled in Medicare?
Yes. Eileen Mills 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 organization bills Medicare for Eileen Mills's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eileen Mills reassigns Medicare benefits to Justice Resource Institute, Inc. (Salem, MA). The 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 Eileen Mills's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Eileen Mills was last updated on June 15, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Eileen Kollmer Mills · NPI 1336520477
Mental Health provider in Acton, Massachusetts. Individual provider, active in the CMS NPPES registry since June 15, 2015.
## Identity
- **NPI:** 1336520477 (Entity type: Individual)
- **Enumerated:** June 15, 2015
- **Primary specialty:** Counselor - Mental Health · taxonomy 101YM0800X
- **Sole proprietor:** No
## Practice location
- **Address:** 360 MASSACHUSETTS AVE, Acton, MA 01720-3750
- **Phone:** (978) 263-3427
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Justice Resource Institute, Inc. (NPI 1093787095, Salem, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** June 15, 2015
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Source: [NPI Profile](https://npiprofile.com/npi/1336520477) · Data from the CMS NPPES public registry.