CHI ST ALEXIUS HEALTH WILLISTON
NPI 1720194624
Emergency Medicine in Williston, ND
About Chi St Alexius Health Williston NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CHI ST ALEXIUS HEALTH WILLISTON (NPI 1720194624) is a healthcare organization registered as an emergency medicine in Williston, North Dakota and active in the NPI registry since August 2006. The organization lists Joseph Ruark, Vp-operational Finance, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 4
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Chi St Alexius Health Williston is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
268Medicare enrollment records show 268 clinicians reassign Medicare billing to Chi St Alexius Health Williston, which bills Medicare for the services they deliver. Of these, 28 practice at this address and 39 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 20
Nearest to this location (20)
See all 268Williston, ND 58801
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Mercy Medical Center's NPI number?
The NPI number for Mercy Medical Center is 1720194624. It was assigned to this organization in the NPPES registry on August 22, 2006. The provider is doing business as Chi St Alexius Health Williston.
Where is Mercy Medical Center located?
Mercy Medical Center is located at 1301 15th Ave W, Williston, ND 58801. The listed phone number is (701) 774-7400.
What is Mercy Medical Center's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Mercy Medical Center enrolled in Medicare?
Yes. Mercy Medical Center is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Mercy Medical Center?
According to the CMS Revalidation Reassignment List (October 2026 release), 268 clinicians in 20 Medicare specialties reassign their Medicare billing to Mercy Medical Center. A 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 the clinician's services. The largest specialties are Diagnostic Radiology (94), Emergency Medicine (46) and Nurse Practitioner (34). Of these, 28 practice at this address and 39 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does Mercy Medical Center accept?
Health plans from Blue Cross Blue Shield of North Dakota and Sanford Health Plan list Mercy Medical Center 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 Mercy Medical Center was last updated on November 17, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Chi St Alexius Health Williston · NPI 1720194624
Emergency Medicine organization in Williston, North Dakota. Organization record, active in the CMS NPPES registry since August 22, 2006.
## Identity
- **NPI:** 1720194624 (Entity type: Organization)
- **Enumerated:** August 22, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **Legal business name:** Mercy Medical Center
- **Organization subpart:** No
- **Authorized official:** Joseph Ruark, VP-OPERATIONAL FINANCE
## Practice location
- **Address:** 1301 15TH AVE W, Williston, ND 58801-3821
- **Phone:** (701) 774-7400 · **Fax:** (701) 774-7479
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 268 clinicians in 20 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Diagnostic Radiology (94), Emergency Medicine (46), Nurse Practitioner (34); 28 practice at this address and 39 within 10 miles; [full list](https://npiprofile.com/npi/1720194624/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** November 17, 2016
- **Other identifiers:** Medicaid 13671 (ND); Medicaid 402272 (MT); Medicare PIN N1000142 (ND); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1720194624) · Data from the CMS NPPES public registry.