These might help:

1. Edit the resulting file validate_index_ims.sql

set heading off
set pagesize 49999
set width 160

spool validate_index_ims.sql

select 'VALIDATE INDEX '||OWNER||'.'||INDEX_NAME||';',
'INSERT INTO MY_INDEX_STATISTICS(SELECT * FROM INDEX_STATS);'
from dba_indexes
where owner <> 'SYS'
and owner <> 'SYSTEM';

spool off

2. Run the edited validate_index_ims.sql

3. Run this script to get an idea about the fragmentation:

select name,
used_space,
del_lf_rows,
lf_rows,
round(del_lf_rows/(lf_rows+0.000000001))*100 "Frag Percent"
from index_stats;

HTH