Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark W Nielsen, MD

Individual provider Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · NPI 1922056894

Dr. Mark W Nielsen, MD is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Sioux City, Iowa. Practices as a sole proprietor. Licensed in Iowa.

Licensed in
IA
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

4630 Singing Hills Blvd Ste A
Sioux City, IA 51106-9702
Phone: (712) 271-8346
Fax: (712) 271-8347
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (primary) Taxonomy 208G00000X · Licence 036115004 (IA)

Record details

NPI number1922056894
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 4, 2006
Last updated in NPPESDecember 7, 2009
Mailing address4630 Singing Hills Blvd, Suite A, Sioux City, IA 51106-9702

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