MRS. ALISSA MARIE LARSEN FNP
NPI 1528751872
Nurse Practitioner - Family in Williston, ND
About Mrs. Alissa Marie Larsen Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MRS. ALISSA MARIE LARSEN FNP (NPI 1528751872) is an individual family provider in Williston, North Dakota, licensed in North Dakota (F05231087) and active in the NPI registry since June 2023. She is enrolled in Medicare PECOS, is affiliated with Mckenzie County Healthcare Systems Inc, and is a graduate of University Of North Dakota School Of Medicine (2023).
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
Mrs. Alissa Marie Larsen Fnp 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 Alissa Larsen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Williston, ND 58801
- Reassigned Medicare billing, North Dakota enrollment
- Also billed through NPI 1902824576 (North Dakota)
- 268 clinicians in this Medicare group
Williston, ND 58801
- Reassigned Medicare billing, North Dakota enrollment
- Also billed through NPI 1518988948 (North Dakota)
- 108 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mckenzie County Healthcare Systems Inc
Critical Access Hospitals · Watford City, NDChi St Alexius Health Williston
Critical Access Hospitals · Williston, NDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 58801 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WILLISTON, ND 58801
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 Alissa Larsen's NPI number?
The NPI number for Alissa Larsen is 1528751872. It was assigned to this individual provider in the NPPES registry on June 1, 2023.
Where is Alissa Larsen located?
Alissa Larsen practices at 1301 15th Ave W, Williston, ND 58801. The listed phone number is (701) 774-7400.
What is Alissa Larsen's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Alissa Larsen enrolled in Medicare?
Yes. Alissa Larsen 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 Alissa Larsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alissa Larsen reassigns Medicare benefits to 2 organizations: Mercy Medical Center (Williston, ND) and Mckenzie County Healthcare Systems Inc (Williston, ND). 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 Alissa Larsen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Alissa Larsen accept?
Health plans from Blue Cross Blue Shield of North Dakota, Medica and Sanford Health Plan list Alissa Larsen 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 Alissa Larsen affiliated with any hospitals?
According to CMS data, Alissa Larsen is affiliated with Mckenzie County Healthcare Systems Inc and Chi St Alexius Health Williston.
When was this NPI record last updated?
The NPPES record for Alissa Larsen was last updated on June 1, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Mrs. Alissa Marie Larsen, FNP · NPI 1528751872
Family physician in Williston, North Dakota. Individual provider, active in the CMS NPPES registry since June 1, 2023.
## Identity
- **NPI:** 1528751872 (Entity type: Individual)
- **Enumerated:** June 1, 2023
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** F05231087 (North Dakota)
- **Sole proprietor:** No
## Practice location
- **Address:** 1301 15TH AVE W, Williston, ND 58801-3821
- **Phone:** (701) 774-7400
## 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): Mercy Medical Center (NPI 1245397736, Williston, ND); Mckenzie County Healthcare Systems Inc (NPI 1396516506, Williston, ND) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of North Dakota School Of Medicine, class of 2023
## Record status
- **NPPES last updated:** June 1, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1528751872) · Data from the CMS NPPES public registry.