Individual provider · Type 1 NPI

John Charles Michalak, MD

Hematology & Oncology Physician · Sioux City, IA

NPI number 1497727663 Active

Practice location

230 Nebraska St
Sioux City, IA 51101-1733

Call (712) 252-0088 Map

Fax (712) 252-5271

Specialties and licenses

TaxonomyCodeLicense
Hematology & Oncology Physician Primary 207RH0003X21969 (IA)

Hematology & Oncology Physician: An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

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About NPI 1497727663

John Charles Michalak, MD's National Provider Identifier is 1497727663, issued on Feb 2, 2006. The primary taxonomy on file is Hematology & Oncology Physician (207RH0003X), and the practice location is in Sioux City, IA. The record was last updated on Jul 13, 2026.