MARY L DAY MS
NPI 1871676726
Counselor - Mental Health in Ellensburg, WA
About Mary L Day Ms NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY L DAY MS (NPI 1871676726) is an individual mental health provider in Ellensburg, Washington, licensed in Washington (LH00009968) and active in the NPI registry since October 2006. She is enrolled in Medicare PECOS and is a graduate of Other (2003).
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
Mary L Day Ms 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 Mary Day reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Ellensburg, WA 98926
- Reassigned Medicare billing, Washington enrollment
- 18 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 Mary Day's NPI number?
The NPI number for Mary Day is 1871676726. It was assigned to this individual provider in the NPPES registry on October 23, 2006.
Where is Mary Day located?
Mary Day practices at 220 W 4th Ave, Ellensburg, WA 98926. The listed phone number is (509) 925-9861.
What is Mary Day's specialty?
The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.
Is Mary Day enrolled in Medicare?
Yes. Mary Day 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 Mary Day's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Day reassigns Medicare benefits to Valley Psychological Services (Ellensburg, WA). 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 Mary Day's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Day accept?
Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Mary Day 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 Mary Day was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Mary L Day, MS · NPI 1871676726
Mental Health provider in Ellensburg, Washington. Individual provider, active in the CMS NPPES registry since October 23, 2006.
## Identity
- **NPI:** 1871676726 (Entity type: Individual)
- **Enumerated:** October 23, 2006
- **Primary specialty:** Counselor - Mental Health · taxonomy 101YM0800X
- **State license:** LH00009968 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 220 W 4TH AVE, Ellensburg, WA 98926-3060
- **Phone:** (509) 925-9861
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Valley Psychological Services (NPI 1356842785, Ellensburg, WA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1871676726) · Data from the CMS NPPES public registry.