/usr/include/dcmtk/dcmiod/ is in libdcmtk-dev 3.6.1~20160216-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dcmtk/dcmiod/cielabutil.h
/usr/include/dcmtk/dcmiod/iodcommn.h
/usr/include/dcmtk/dcmiod/ioddef.h
/usr/include/dcmtk/dcmiod/iodimage.h
/usr/include/dcmtk/dcmiod/iodmacro.h
/usr/include/dcmtk/dcmiod/iodrules.h
/usr/include/dcmtk/dcmiod/iodtypes.h
/usr/include/dcmtk/dcmiod/iodutil.h
/usr/include/dcmtk/dcmiod/modacquisitioncontext.h
/usr/include/dcmtk/dcmiod/modbase.h
/usr/include/dcmtk/dcmiod/modcommoninstanceref.h
/usr/include/dcmtk/dcmiod/modenhequipment.h
/usr/include/dcmtk/dcmiod/modenhusimage.h
/usr/include/dcmtk/dcmiod/modenhusseries.h
/usr/include/dcmtk/dcmiod/modequipment.h
/usr/include/dcmtk/dcmiod/modfor.h
/usr/include/dcmtk/dcmiod/modgeneralimage.h
/usr/include/dcmtk/dcmiod/modgeneralseries.h
/usr/include/dcmtk/dcmiod/modgeneralstudy.h
/usr/include/dcmtk/dcmiod/modhelp.h
/usr/include/dcmtk/dcmiod/modimagepixel.h
/usr/include/dcmtk/dcmiod/modmultiframedimension.h
/usr/include/dcmtk/dcmiod/modmultiframefg.h
/usr/include/dcmtk/dcmiod/modpatient.h
/usr/include/dcmtk/dcmiod/modpatientstudy.h
/usr/include/dcmtk/dcmiod/modsegmentationseries.h
/usr/include/dcmtk/dcmiod/modsopcommon.h
/usr/include/dcmtk/dcmiod/modsynchronisation.h
/usr/include/dcmtk/dcmiod/modusfor.h