Iowa Code § 135B.23

Each hospital shall arrange for such services and for the direction and supervision of its pathology or radiology department by entering into either an oral or written agreement with a doctor who is a member of or acceptable to the hospital medical staff. Such doctor may or may not be a specialist. The department may be supervised and directed by a qualified member of the staff and specific services may be referred to a specialist, or the specialist may also direct and supervise the department as may be desired. Any contract so entered into shall be in accordance with the provisions of this subchapter.