Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Mark S Claussen, MD

Individual provider Surgery Physician · NPI 1447278171

Mark S Claussen, MD practises General Surgery in Bemidji, Minnesota. Graduated from University of Minnesota Medical School in 1989, 37 years ago. Practices with Sanford Health of Northern Minnesota, a 349-clinician group and accepts Medicare assignment. Licensed in Minnesota.

Years since qualifying
37
Trained at
University of Minnesota Medical School
Licensed in
MN
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1233 34th St NW
Bemidji, MN 56601-5112
Phone: (218) 333-5283
Fax: (218) 759-5279
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 36995 (MN)

Record details

NPI number1447278171
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 18, 2006
Last updated in NPPESMarch 29, 2022
Certification dateMarch 29, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGENERAL SURGERY
Medical schoolUNIVERSITY OF MINNESOTA MEDICAL SCHOOL
Graduated 1989 (37 years in practice)
Group practice Sanford Health Of Northern Minnesota — 349 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 41 times · 59th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 27 times · 54th percentile
Hernia repair - groin (open) 1–10 times
Removal of tissue 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients153
Services billed 340 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Sanford Health of Northern Minnesota

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 349 clinicians in the practice; 12 are shown here.

Other providers in Bemidji