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MACKINAC STRAITS HEALTH SYSTEM INC
NPI 1659868206
Clinic/Center - Rural Health in Cheboygan, MI

Active since April 19, 2018
920 S HURON ST, CHEBOYGAN, MI 49721(231) 597-8192(231) 597-8463 Get Directions Write a Review

NPPES record last updated: June 9, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 30, 2024, Jun 9, 2022, May 3, 2021 and 2 more (5 updates tracked since 2018).

About Mackinac Straits Health System Inc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MACKINAC STRAITS HEALTH SYSTEM INC (NPI 1659868206), doing business as Rivertown Medical Clinic, is a healthcare organization registered as a rural health in Cheboygan, Michigan and active in the NPI registry since April 2018. The organization lists Sonja Sprague, Credentialing, as its authorized official.

NPPES Registry Identity

NPI1659868206
Entity TypeOrganization
Primary Taxonomy261QR1300X
Legal Business NameMACKINAC STRAITS HEALTH SYSTEM INC
Location Address920 S HURON STCheboygan, MI 49721-2267
Mailing Address1140 N State StSaint Ignace, MI 49781-1013
Phone(231) 597-8192
Fax(231) 597-8463
Organization SubpartYes
Authorized OfficialSonja SpragueCredentialing · (906) 643-0451
Enumeration DateApril 19, 2018
Last NPPES UpdateJune 9, 20265 updates tracked since enumeration
NPPES CertifiedJune 9, 2026
✔ NPI 1659868206 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyClinic/Center · Rural HealthAmbulatory Health Care Facilities
Taxonomy Code261QR1300X
Also ListedFamily MedicineTaxonomy 207Q00000X
920 S HURON ST, Cheboygan, MI 49721
Open in Google Maps ↗

Other Names 1

Doing Business AsRivertown Medical Clinic

Other Identifiers 1

Other238716Medicare

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company.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)

Mackinac Straits Health System Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

60

Medicare enrollment records show 60 clinicians reassign Medicare billing to Mackinac Straits Health System Inc, which bills Medicare for the services they deliver. Of these, 3 practice within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 12

Nurse Practitioner13
Emergency Medicine11
Family Practice11
Certified Registered Nurse Anesthetist (CRNA)8
General Surgery5
Orthopedic Surgery5
Internal Medicine2
Hematology/Oncology1
4 other specialties4

Nearest to this location (20)

See all 60
Tymon Horn, DO
Emergency Medicine
NPI 1104311786
748 S MAIN ST
Cheboygan, MI 49721
(231) 487-2490
✔ PECOS✔ Accepts Medicare0.3 mi
Roderick Baltzer, DO
Family Practice
NPI 1760564041
802 S MAIN ST STE 3
Cheboygan, MI 49721
(231) 627-3002
✔ PECOS1.6 mi
Loretta Leja, M.D.
Family Practice
NPI 1831122324
920 S HURON ST
Cheboygan, MI 49721
(231) 597-8192
✔ PECOS1.7 mi
Catherine Nowka, FNP
Nurse Practitioner
NPI 1902988777
580 S. NICOLET STREET
Mackinaw City, MI 49701
(231) 436-9900
✔ PECOS15 mi
Gregory Hessler, M D
Family Practice
NPI 1326156928
7474 MARKET STREET
Mackinac Island, MI 49757
(231) 534-7200
✔ PECOS15 mi
Ashley Hilbrand, M.D.
Family Practice
NPI 1760862452
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-8585
✔ PECOS✔ Accepts Medicare18 mi
Nicholas Newhouse, CRNA
Certified Registered Nurse Anesthetist (CRNA)
NPI 1801130695
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-8585
18 mi
Shannon Slocum
Nurse Practitioner
NPI 1295350429
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-0466
✔ PECOS✔ Accepts Medicare18 mi
Darrin Benzing, M.D.
Emergency Medicine
NPI 1447293618
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-8585
✔ PECOS18 mi
Amy Bolmer, D.O.
Medical Oncology
NPI 1366494270
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-0451
✔ PECOS✔ Accepts Medicare18 mi
Sara Brown
Nurse Practitioner
NPI 1689422628
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-8585
✔ PECOS18 mi
Lauren Buhr, MD
Family Practice
NPI 1548821010
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-8585
✔ PECOS18 mi
Lene Heinlen, DO
Family Practice
NPI 1841267762
1140 N STATE ST
Saint Ignace, MI 49781
(906) 328-2148
✔ PECOS✔ Accepts Medicare18 mi
Brent Paape, NP
Nurse Practitioner
NPI 1053906909
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-1188
✔ PECOS✔ Accepts Medicare18 mi
Dana Paape
Certified Registered Nurse Anesthetist (CRNA)
NPI 1174157192
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-1188
✔ Accepts Medicare18 mi
Monica Schrage, DNP
Nurse Practitioner
NPI 1427870112
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-0405
✔ PECOS✔ Accepts Medicare18 mi
Carrie King
Registered Dietitian or Nutrition Professional
NPI 1073222022
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-8585
21 mi
Joseph Weistroffer, M.D.
Orthopedic Surgery
NPI 1780656678
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-8585
✔ PECOS21 mi
Trysha Wolford, CRNA
Certified Registered Nurse Anesthetist (CRNA)
NPI 1508437526
1140 N STATE ST
Saint Ignace, MI 49781
(906) 643-8585
✔ Accepts Medicare21 mi
Susan Strich, M.D.
Emergency Medicine
NPI 1326026501
1140 NORTH STATE STREET
Saint Ignace, MI 49781
(906) 643-8585
✔ PECOS✔ Accepts Medicare21 mi
See all 60 clinicians

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 Mackinac Straits Health System Inc's NPI number?

The NPI number for Mackinac Straits Health System Inc is 1659868206. It was assigned to this organization in the NPPES registry on April 19, 2018. The provider is doing business as Rivertown Medical Clinic.

Where is Mackinac Straits Health System Inc located?

Mackinac Straits Health System Inc is located at 920 S Huron St, Cheboygan, MI 49721. The listed phone number is (231) 597-8192.

What is Mackinac Straits Health System Inc's specialty?

The primary specialty registered for this NPI is Clinic/Center, specializing in Rural Health, with taxonomy code 261QR1300X.

Is Mackinac Straits Health System Inc enrolled in Medicare?

Yes. Mackinac Straits Health System Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Mackinac Straits Health System Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 60 clinicians in 12 Medicare specialties reassign their Medicare billing to Mackinac Straits Health System Inc. 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 Nurse Practitioner (13), Emergency Medicine (11) and Family Practice (11). Of these, 3 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

What insurance does Mackinac Straits Health System Inc accept?

Health plans from Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company list Mackinac Straits Health System Inc 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 Mackinac Straits Health System Inc was last updated on June 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.