DR. MARISSA ARMSTRONG DNP, FNP-C
NPI 1609437508
Nurse Practitioner in Post Falls, ID
About Dr. Marissa Armstrong Dnp, Fnp-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARISSA ARMSTRONG DNP, FNP-C (NPI 1609437508) is an individual nurse practitioner in Post Falls, Idaho, licensed in Idaho (62266) and active in the NPI registry since June 2019. She is enrolled in Medicare PECOS, is affiliated with Kootenai Health, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
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
Dr. Marissa Armstrong Dnp, Fnp-c 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
2Medicare enrollment records show Marissa Armstrong reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Post Falls, ID 83854
- Reassigned Medicare billing, Idaho enrollment
- 76 clinicians in this Medicare group
Spokane Valley, WA 99216
- Reassigned Medicare billing, Washington enrollment
- 278 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Kootenai Health
Acute Care Hospitals · Coeur D'alene, IDNorthwest Specialty Hospital
Acute Care Hospitals · Post Falls, IDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 83854 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 17
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
POST FALLS, ID 83854
POST FALLS, ID 83854
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 Marissa Armstrong's NPI number?
The NPI number for Marissa Armstrong is 1609437508. It was assigned to this individual provider in the NPPES registry on June 22, 2019.
Where is Marissa Armstrong located?
Marissa Armstrong practices at 750 N Syringa St Ste 100, Post Falls, ID 83854. The listed phone number is (208) 262-2600.
What is Marissa Armstrong's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Marissa Armstrong enrolled in Medicare?
Yes. Marissa Armstrong 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 Marissa Armstrong's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marissa Armstrong reassigns Medicare benefits to 2 organizations: North Idaho Day Surgery LLC (Post Falls, ID) and Community Health Association Of Spokane (Spokane Valley, 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 Marissa Armstrong's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marissa Armstrong accept?
Health plans from PacificSource Health Plans, Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Marissa Armstrong 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 Marissa Armstrong affiliated with any hospitals?
According to CMS data, Marissa Armstrong is affiliated with Kootenai Health and Northwest Specialty Hospital.
When was this NPI record last updated?
The NPPES record for Marissa Armstrong was last updated on February 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Dr. Marissa Armstrong, DNP, FNP-C · NPI 1609437508
Nurse Practitioner physician in Post Falls, Idaho. Individual provider, active in the CMS NPPES registry since June 22, 2019.
## Identity
- **NPI:** 1609437508 (Entity type: Individual)
- **Enumerated:** June 22, 2019
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** 62266 (Idaho)
- **Sole proprietor:** No
## Practice location
- **Address:** 750 N SYRINGA ST STE 100, Post Falls, ID 83854-5275
- **Phone:** (208) 262-2600 · **Fax:** (208) 262-2700
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): North Idaho Day Surgery LLC (NPI 1104824739, Post Falls, ID); Community Health Association Of Spokane (NPI 1336219088, Spokane Valley, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** February 2, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1609437508) · Data from the CMS NPPES public registry.