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

Mark O. Carlson, MD

Individual provider Internal Medicine Physician · NPI 1609837368

Mark O. Carlson, MD is an Internal Medicine in Sioux City, Iowa. Graduated from University of Minnesota Medical School in 1986, 40 years ago. Practices with Siouxland Adult Medicine, PLLC, a 2-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
40
Trained at
University of Minnesota Medical School
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

1605 Douglas St
Sioux City, IA 51105-1109
Phone: (712) 234-1005
Fax: (712) 234-0015
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 27247 (IA)

Record details

NPI number1609837368
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 31, 2006
Last updated in NPPESNovember 22, 2012
Mailing address1605 Douglas St, Sioux City, IA 51105-1109

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MINNESOTA MEDICAL SCHOOL
Graduated 1986 (40 years in practice)
Group practice Siouxland Adult Medicine, Pllc — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Sioux City