MARION ARTHUR FOSSUM MD
NPI 1356875736
Psychiatry & Neurology - Neurology in Medical Lake, WA
About Marion Arthur Fossum Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARION ARTHUR FOSSUM MD (NPI 1356875736) is an individual neurology provider in Medical Lake, Washington, licensed in Missouri (2024012104) and active in the NPI registry since April 2017. He is enrolled in Medicare PECOS, is affiliated with Franciscan Health Lafayette, and maintains 7 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 7
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
Marion Arthur Fossum Md 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
14Medicare enrollment records show Marion Fossum reassigns Medicare billing to 14 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Spokane, WA 99202
- Reassigned Medicare billing, Washington enrollment
- 4,383 clinicians in this Medicare group
Sandy, OR 97055
- Reassigned Medicare billing, Oregon enrollment
- 1,248 clinicians in this Medicare group
Vancouver, WA 98686
- Reassigned Medicare billing, Washington enrollment
- 754 clinicians in this Medicare group
Joplin, MO 64804
- Reassigned Medicare billing, Missouri enrollment
- Also billed through NPI 1679517023 (Missouri)
- 171 clinicians in this Medicare group
Hannibal, MO 63401
- Reassigned Medicare billing, Missouri enrollment
- 196 clinicians in this Medicare group
Jefferson City, MO 65109
- Reassigned Medicare billing, Missouri enrollment
- 74 clinicians in this Medicare group
Mishawaka, IN 46544
- Reassigned Medicare billing, Indiana enrollment
- 1,396 clinicians in this Medicare group
Bainbridge, IN 46105
- Reassigned Medicare billing, Indiana enrollment
- 401 clinicians in this Medicare group
Asheville, NC 28803
- Reassigned Medicare billing, North Carolina enrollment
- 2,998 clinicians in this Medicare group
Lynchburg, VA 24503
- Reassigned Medicare billing, Washington enrollment
- 8 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 4
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Franciscan Health Lafayette
Acute Care Hospitals · Lafayette, INHannibal Regional Hospital
Acute Care Hospitals · Hannibal, MOFreeman Health System - Freeman West
Acute Care Hospitals · Joplin, MOFreeman Neosho Hospital
Critical Access Hospitals · Neosho, MONovant Health Rowan Medical Center
Acute Care Hospitals · Salisbury, NCPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 99022 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Marion Fossum's NPI number?
The NPI number for Marion Fossum is 1356875736. It was assigned to this individual provider in the NPPES registry on April 12, 2017.
Where is Marion Fossum located?
Marion Fossum practices at 1717 S Ritchey Rd, Medical Lake, WA 99022. The listed phone number is (509) 590-8766.
What is Marion Fossum's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.
Is Marion Fossum enrolled in Medicare?
Yes. Marion Fossum 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 Marion Fossum's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marion Fossum reassigns Medicare benefits to 14 organizations: Multicare Health System (Spokane, WA), Legacy Clinics LLC (Sandy, OR), Legacy Salmon Creek Hospital (Vancouver, WA), Freeman-Oak Hill Health System (Joplin, MO), Hannibal Regional Healthcare System Inc (Hannibal, MO) and 9 more organizations, listed in the Medicare section above. 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 Marion Fossum's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marion Fossum accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of NC, BridgeSpan Health Company, CareSource and Cigna Healthcare and 5 other insurers list Marion Fossum 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 Marion Fossum affiliated with any hospitals?
According to CMS data, Marion Fossum is affiliated with Franciscan Health Lafayette, Hannibal Regional Hospital, Freeman Health System - Freeman West, Freeman Neosho Hospital and Novant Health Rowan Medical Center.
When was this NPI record last updated?
The NPPES record for Marion Fossum was last updated on October 16, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Marion Arthur Fossum, MD · NPI 1356875736
Neurology physician in Medical Lake, Washington. Individual provider, active in the CMS NPPES registry since April 12, 2017.
## Identity
- **NPI:** 1356875736 (Entity type: Individual)
- **Enumerated:** April 12, 2017
- **Primary specialty:** Psychiatry & Neurology - Neurology · taxonomy 2084N0400X
- **State license:** 2024012104 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1717 S RITCHEY RD, Medical Lake, WA 99022-8792
- **Phone:** (509) 590-8766
## 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:** 14 organizations under Medicare reassignment (form CMS-855R): Multicare Health System (NPI 1730687161, Spokane, WA); Legacy Clinics LLC (NPI 1730472192, Sandy, OR); Legacy Salmon Creek Hospital (NPI 1356357784, Vancouver, WA); Freeman-Oak Hill Health System (NPI 1891809679, Joplin, MO); Hannibal Regional Healthcare System Inc (NPI 1003956095, Hannibal, MO); and 9 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** October 16, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1356875736) · Data from the CMS NPPES public registry.