HEATHER ANN DAY APNP
NPI 1265767487
Nurse Practitioner - Family in Centralia, WA
About Heather Ann Day Apnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HEATHER ANN DAY APNP (NPI 1265767487) is an individual family provider in Centralia, Washington, licensed in Washington (AP60466571) and active in the NPI registry since October 2009. She is enrolled in Medicare PECOS, is affiliated with Providence Centralia Hospital, and is a graduate of Other (2009).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 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
Heather Ann Day Apnp 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
4Medicare enrollment records show Heather Day reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Centralia, WA 98531
- Reassigned Medicare billing, Washington enrollment
- 68 clinicians in this Medicare group
Olympia, WA 98512
- Reassigned Medicare billing, Washington enrollment
- 4,383 clinicians in this Medicare group
Longview, WA 98632
- Reassigned Medicare billing, Washington enrollment
- 106 clinicians in this Medicare group
Arlington, WA 98223
- Reassigned Medicare billing, Washington enrollment
- 49 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 3
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Providence Centralia Hospital
Acute Care Hospitals · Centralia, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98531 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 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CENTRALIA, WA 98531
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 Heather Day's NPI number?
The NPI number for Heather Day is 1265767487. It was assigned to this individual provider in the NPPES registry on October 6, 2009. The provider is also known as Heather A Lassila Arnp.
Where is Heather Day located?
Heather Day practices at 1800 Cooks Hill Rd Ste G, Centralia, WA 98531. The listed phone number is (360) 736-3042.
What is Heather Day's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Heather Day enrolled in Medicare?
Yes. Heather 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 organizations bill Medicare for Heather Day's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Heather Day reassigns Medicare benefits to 4 organizations: Lewis County Community Health Services (Centralia, WA), Multicare Health System (Olympia, WA), Cep America LLC (Longview, WA) and Northwest Physician Associates PC (Arlington, WA). 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 Heather Day's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Heather Day accept?
Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Heather 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.
Is Heather Day affiliated with any hospitals?
According to CMS data, Heather Day is affiliated with Providence Centralia Hospital.
When was this NPI record last updated?
The NPPES record for Heather Day was last updated on June 16, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Heather Ann Day, APNP · NPI 1265767487
Family physician in Centralia, Washington. Individual provider, active in the CMS NPPES registry since October 6, 2009.
## Identity
- **NPI:** 1265767487 (Entity type: Individual)
- **Enumerated:** October 6, 2009
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** AP60466571 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1800 COOKS HILL RD STE G, Centralia, WA 98531-9162
- **Phone:** (360) 736-3042 · **Fax:** (360) 736-2967
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Lewis County Community Health Services (NPI 1811669658, Centralia, WA); Multicare Health System (NPI 1831609775, Olympia, WA); Cep America LLC (NPI 1548920598, Longview, WA); Northwest Physician Associates PC (NPI 1275567919, Arlington, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** June 16, 2025
- **Other identifiers:** Medicaid 2037352 (WA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1265767487) · Data from the CMS NPPES public registry.